---
product_id: 12833947
title: "Watts LF25AUB-Z3 Water Pressure Reducing Valve NPT Female Union x NPT Female, Polymer Seat, 3/4 Inch"
brand: "watts"
price: "€ 284.05"
currency: EUR
in_stock: true
reviews_count: 13
category: "Watts"
url: https://www.desertcart.hr/products/12833947-watts-lf25aub-z3-water-pressure-reducing-valve-npt-female-union
store_origin: HR
region: Croatia
---

# Easy install & replaceable seat Adjustable pressure 25-75 psi Lead-free brass corrosion resistant Watts LF25AUB-Z3 Water Pressure Reducing Valve NPT Female Union x NPT Female, Polymer Seat, 3/4 Inch

**Brand:** watts
**Price:** € 284.05
**Availability:** ✅ In Stock

## Summary

> 🚰 Protect your pipes, save water, and upgrade your home’s flow game!

## Quick Answers

- **What is this?** Watts LF25AUB-Z3 Water Pressure Reducing Valve NPT Female Union x NPT Female, Polymer Seat, 3/4 Inch by watts
- **How much does it cost?** € 284.05 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/12833947-watts-lf25aub-z3-water-pressure-reducing-valve-npt-female-union)

## Best For

- watts enthusiasts

## Why This Product

- Trusted watts brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Hassle-Free Maintenance:** Replaceable seat module and robust diaphragm design make upkeep simple and cost-effective.
- • **Universal Compatibility:** NPT female union connections with options for PEX, CPVC, and Quick-Connect fittings for versatile installation.
- • **Thermal Expansion Bypass:** Built-in bypass feature prevents pressure build-up from thermal expansion, safeguarding your system.
- • **Precision Pressure Control:** Factory preset at 50 psi with smooth adjustability up to 75 psi for optimal plumbing protection.
- • **Durable Lead-Free Construction:** Crafted from lead-free brass with stainless steel components ensuring long-lasting corrosion resistance.

## Overview

The Watts LF25AUB-Z3 is a 3/4 inch lead-free brass water pressure reducing valve designed to regulate incoming water pressure between 25 and 75 psi, protecting plumbing systems in residential, commercial, and industrial settings. Featuring corrosion-resistant materials, a thermal expansion bypass, and easy installation with replaceable components, it ensures reliable, long-term performance and water conservation.

## Description

This 3/4 inch lead free brass water pressure reducing valve is designed to reduce incoming water pressure to protect plumbing systems and reduce water consumption for commercial, industrial, and residential applications. The easy maintenance assembly consists of a replaceable seat module, NPT threaded female union inlet by NPT female outlet and a bypass feature to control thermal expansion pressure. The temperature range is 33 to 160 degrees F (0.5 to 71 degrees C). The standard pressure setting is 50 psi (345 kPa) with maximum working pressure at 300 psi (20.7 bar).

Review: Great valve, install was a breeze, works like a charm! - My house was built in 1966 and had a Watts 3/4" U5B series pressure reducing valve. According to the Watts website, the U5B is a higher performance/capacity model than this LF25AUB-Z3 3/4", and comparing the charts on the volume @pressure, there does appear to be a difference, but it looked small at the pressures that represent my operating environment. My old U5B was no longer regulating pressure, and so everything in my house was being subjected to 120psi that comes off my street. This is relatively close to the 150psi safety release on the hotwater tank and it was wreaking havoc with anything less than contractor grade garden hoses (blowing them apart after a few months in service). I became concerned that the high pressure might also destroy a toilet/sink supply line and in the worst case, flood the house while we were gone. I tried to get a repair kit for my U5B and by all accounts I ordered the right kit, but none of the parts fit. Maybe someone accidentally swapped the parts bags between two kits while comparing, or maybe the U5B I had was so old that the design had changed a bit. For whatever reason, the bell housing dimensions on my U5B did not match the dimensions specs noted by Watts. Even though "3/4" was clearly forged in the side of the valve and the sticker on it clearly read U5B. Anyway, I don't know if the old valve was Lead-Free or not. So I decided it was worth it to just order a new valve. The direct modern replacement for the U5B is going for around $300 +/-, depending on your source, and desertcart didn't have any sources. But the LF25AUB-Z3 3/4" was $80 shipped to my door. So I took a chance and ordered it. Installation was a breeze, turned off the main supply, opened a sink to bleed the pressure off the system, shut off the hot water heater, then just backed off the old unit and put the new one in. The new one is maybe 3/16" shorter in overall length, but there is plenty of slack/give in the copper pipes I have to allow for some differences in size. It's amazing the difference this has made for my appliances and what not. We used to get pretty bad water-hammer, installing arresters helped, but did not eliminate. With the new pressure reducing valve in place there is no more water hammer, my automatic icemaker is working clog-free, and the refrigerator door water dispenser works much better. I may miss the 120psi when it comes to working outside, but so far I love the new pressure and there is room to turn it up a bit. The valve comes factory preset to 50psi and can be adjusted up to 75psi. I don't recall the lower limit. Oh, and I took the old valve apart. To my surprise the diaphragm was perfectly intact. What had failed was the bypass valve. It appears to have rotted/worn away small enough to come apart and it got trapped by the screen. And another interesting fact was that I'm quite sure that screen had never been checked in the 49ish years it had been in service and it was perfectly clean, pretty cool.
Review: The build quality of the valve is exceptional - I recently purchased the Watts Water Pressure Reducing Valve as a replacement for my old valve, which was causing my water heater to leak. Since installing it in mid-March 2024, I have been thoroughly impressed with its performance and reliability. Installation Experience The installation process was straightforward and hassle-free. The valve came with clear instructions, and I had it installed within an hour. Even for someone who isn’t a professional plumber, the process was manageable, and all the necessary components were included. Performance Since installing the Watts valve, I haven’t experienced any issues. The water pressure in my home has been consistently regulated, preventing any undue stress on my plumbing system. This has been especially important for protecting my new water heater, ensuring it operates efficiently without any risk of damage from high water pressure. It feels robust and well-made, indicating that it will last for many years.

## Features

- Reduces incoming water pressure to protect plumbing systems and reduce water consumption in commercial industrial and residential applications
- Water supply pressures range is 25 to 75 psi (172 to 517 kPa) with the standard setting at 50 psi (345 kPa)
- Lead free copper silicon alloy with stainless steel strainer and corrosion resistant adjusting and cage screws, high-temperature diaphragm, replaceable seat module
- End connection options such as PEX, CPVC, and Quick-Connect
- The standard bypass feature permits the flow of water back through the valve into the main when pressures, due to thermal expansion on the outlet side of the valve, exceed the pressure in the main supply

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00CBIF9K0 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #17,600 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #20 in Relief Valves |
| Brand | Watts |
| Color | Polymer Seat |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,007) |
| Date First Available | November 9, 2004 |
| Exterior Finish | Stainless Steel |
| Global Trade Identification Number | 00098268329704, 00098268462968 |
| Included Components | 25AUB-Z3 |
| Inlet Connection Size | 0.75 Inches |
| Inlet Connection Type | National Pipe Tapered |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 3.3 pounds |
| Item dimensions L x W x H | 6 x 3 x 6 inches |
| Item model number | LF25AUB-Z3 |
| Manufacturer | Watts |
| Material | Brass finish |
| Maximum Operating Pressure | 300 Pound per Square Inch |
| Measurement System | inch, metric |
| Number Of Pieces | 1 |
| Number of Ports | 2 |
| Outlet Connection Size | 0.75 Inches |
| Outlet Connection Type | FNPT |
| Part Number | LF25AUB-Z3 3/4" |
| Product Dimensions | 6 x 3 x 6 inches |
| Size | 3/4 Inch |
| Style | 25-75 psi |
| UPC | 098268329704 733353752943 |
| Warranty Description | 1-Year Manufacturer Limited |

## Product Details

- **Brand:** Watts
- **Exterior Finish:** Stainless Steel
- **Inlet Connection Size:** 0.75 Inches
- **Inlet Connection Type:** National Pipe Tapered
- **Item dimensions L x W x H:** 6 x 3 x 6 inches
- **Material:** Brass finish
- **Maximum Operating Pressure:** 300 Pound per Square Inch
- **Number of Ports:** 2
- **Outlet Connection Size:** 0.75 Inches
- **Outlet Connection Type:** FNPT

## Images

![Watts LF25AUB-Z3 Water Pressure Reducing Valve NPT Female Union x NPT Female, Polymer Seat, 3/4 Inch - Image 1](https://m.media-amazon.com/images/I/61ufekjhulL.jpg)

## Questions & Answers

**Q: Where this product is manufactured?**
A: It’s assembled in USA.

**Q: where is the stainless steel strainer located?**
A: The strainers are located inside , which is accessible through the two caps on the bottom!

**Q: Will the PRV work in a vertical position ?**
A: It should, it is spring loaded mining it works with water pressure and spring pressure to control the flow

**Q: how many turns is needed on the adjustment bolt before you notice a difference in water pressure ?**
A: The range on this pressure reducing valve is 25-75 PSI with 300 PSI maximum pressure as you turn the adjustment screw down(clock wise) you will see the change pretty rapidly since the amount of threads are not that many, the key is to have a pressure gauge visible so you can watch the PSI go up & down, what you do is add tendon on a coil spring internal!

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great valve, install was a breeze, works like a charm!
*by J***L on April 26, 2015*

My house was built in 1966 and had a Watts 3/4" U5B series pressure reducing valve. According to the Watts website, the U5B is a higher performance/capacity model than this LF25AUB-Z3 3/4", and comparing the charts on the volume @pressure, there does appear to be a difference, but it looked small at the pressures that represent my operating environment. My old U5B was no longer regulating pressure, and so everything in my house was being subjected to 120psi that comes off my street. This is relatively close to the 150psi safety release on the hotwater tank and it was wreaking havoc with anything less than contractor grade garden hoses (blowing them apart after a few months in service). I became concerned that the high pressure might also destroy a toilet/sink supply line and in the worst case, flood the house while we were gone. I tried to get a repair kit for my U5B and by all accounts I ordered the right kit, but none of the parts fit. Maybe someone accidentally swapped the parts bags between two kits while comparing, or maybe the U5B I had was so old that the design had changed a bit. For whatever reason, the bell housing dimensions on my U5B did not match the dimensions specs noted by Watts. Even though "3/4" was clearly forged in the side of the valve and the sticker on it clearly read U5B. Anyway, I don't know if the old valve was Lead-Free or not. So I decided it was worth it to just order a new valve. The direct modern replacement for the U5B is going for around $300 +/-, depending on your source, and Amazon didn't have any sources. But the LF25AUB-Z3 3/4" was $80 shipped to my door. So I took a chance and ordered it. Installation was a breeze, turned off the main supply, opened a sink to bleed the pressure off the system, shut off the hot water heater, then just backed off the old unit and put the new one in. The new one is maybe 3/16" shorter in overall length, but there is plenty of slack/give in the copper pipes I have to allow for some differences in size. It's amazing the difference this has made for my appliances and what not. We used to get pretty bad water-hammer, installing arresters helped, but did not eliminate. With the new pressure reducing valve in place there is no more water hammer, my automatic icemaker is working clog-free, and the refrigerator door water dispenser works much better. I may miss the 120psi when it comes to working outside, but so far I love the new pressure and there is room to turn it up a bit. The valve comes factory preset to 50psi and can be adjusted up to 75psi. I don't recall the lower limit. Oh, and I took the old valve apart. To my surprise the diaphragm was perfectly intact. What had failed was the bypass valve. It appears to have rotted/worn away small enough to come apart and it got trapped by the screen. And another interesting fact was that I'm quite sure that screen had never been checked in the 49ish years it had been in service and it was perfectly clean, pretty cool.

### ⭐⭐⭐⭐⭐ The build quality of the valve is exceptional
*by M***R on June 5, 2024*

I recently purchased the Watts Water Pressure Reducing Valve as a replacement for my old valve, which was causing my water heater to leak. Since installing it in mid-March 2024, I have been thoroughly impressed with its performance and reliability. Installation Experience The installation process was straightforward and hassle-free. The valve came with clear instructions, and I had it installed within an hour. Even for someone who isn’t a professional plumber, the process was manageable, and all the necessary components were included. Performance Since installing the Watts valve, I haven’t experienced any issues. The water pressure in my home has been consistently regulated, preventing any undue stress on my plumbing system. This has been especially important for protecting my new water heater, ensuring it operates efficiently without any risk of damage from high water pressure. It feels robust and well-made, indicating that it will last for many years.

### ⭐⭐⭐⭐⭐ Check you pressure. If High, BUY THIS!
*by S***C on December 20, 2016*

Update: 6 years later and this thing is still going strong! Had two instance of faucet exploded before pressure valve replacement. Not a single appliances or faucet leaks since replacement! Update: 18 months later this thing pay for itself. I have been consistently saving between 15-30% on my water bills. No change in water use habits. Even with guests staying over, water bill is still lower compare to same season the year before. This product is probably one of the best single product anyone can buy for their home. It does what it is design to do AND MORE. First, I live up the cliff on the Hudson River side (500+fts above sea level). Water company pump up the water pressure to get the water to us in utility lines. My home pressure reading was 115psi at any giving point. I have an old home and a lot of leaking pipe joints. The house already have the older model Watts 25AUB-Z3 installed. However, I tried many time to adjust the pressure with no luck. I come to the conclusion that the valve original to the 50+ years old home is not working. I then did some home work online and take on the task of replacing the value. Took care of it after some major error (PLEASE make sure you install it on the right direction! I screw that up and end up breaking my water meter and have to call the utility company!). The pressure of all the water lines including my hot water lines drop to 50psi instantly. This save all my pipes, appliances, and stop all the water hammering.

## Frequently Bought Together

- Watts LF25AUB-Z3 Water Pressure Reducing Valve NPT Female Union x NPT Female, Polymer Seat, 3/4 Inch
- MEASUREMAN 0-200 PSI Water Pressure Gauge, 2-1/2'' Dial, Hose bib Pressure Gauge, Home Water Pressure Tester, Durable 3/4” Hose Thread, Water Pressure Gauge for Home

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-03-14*