---
product_id: 517476916
title: "Ibergrif M20521 Toilet Cistern Inlet Valve G3/8 Inch – Bottom or Side Entry"
brand: "ibergrif"
price: "€ 16.72"
currency: EUR
in_stock: true
reviews_count: 13
category: "Ibergrif"
url: https://www.desertcart.hr/products/517476916-ibergrif-m20521-toilet-cistern-inlet-valve-g3-8-inch-bottom
store_origin: HR
region: Croatia
---

# Dual bottom/side inlet installation G3/8 inch (16mm) precision thread 100,000+ cycles durable brass nut Ibergrif M20521 Toilet Cistern Inlet Valve G3/8 Inch – Bottom or Side Entry

**Brand:** ibergrif
**Price:** € 16.72
**Availability:** ✅ In Stock

## Summary

> 🚽 Upgrade your throne with precision and durability — flush smarter, not harder!

## Quick Answers

- **What is this?** Ibergrif M20521 Toilet Cistern Inlet Valve G3/8 Inch – Bottom or Side Entry by ibergrif
- **How much does it cost?** € 16.72 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/517476916-ibergrif-m20521-toilet-cistern-inlet-valve-g3-8-inch-bottom)

## Best For

- ibergrif enthusiasts

## Why This Product

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

## Key Features

- • **Precision Water Control:** Adjustable float valve height with 5mm increments lets you fine-tune water levels for optimal flush efficiency.
- • **Clean Water, Quiet Flush:** Integrated filter net traps impurities, preventing clogs and reducing noise—because your bathroom deserves the best.
- • **Flexible Installation Modes:** Switch effortlessly between bottom or side inlet setups to match your toilet design perfectly.
- • **Universal Fit, Zero Guesswork:** G3/8 inch (16mm) thread ensures seamless compatibility with most dual flush toilets—ditch the hassle of returns.
- • **Built to Last, Built to Impress:** Premium ABS body paired with brass hex nuts guarantees rugged durability and a leak-proof seal for 100,000+ uses.

## Overview

The Ibergrif M20521 is a high-performance toilet inlet valve featuring a G3/8 inch (16mm) thread size compatible with most dual flush systems. It supports both bottom and side inlet installations, offers adjustable float valve height for precise water level control, and incorporates a filter net to block impurities. Constructed from premium ABS with brass fastening nuts, it delivers exceptional durability rated for over 100,000 cycles, ensuring a reliable, quiet, and efficient flush every time.

## Description

From the manufacturer Maximize toilet performance and save water! About Ibergrif Ibergrif is one of the leading manufacturers and suppliers of sanitary ware in Spain. With an uncompromising dedication to quality and a passion for lifestyle, we are producing products that perfectly meet to the needs and lifestyles of our customers. It is our goal to help customers live a more beautiful and affordable life. Find inspiration for your kitchen and bathroom with Ibergrif! Long-life Easy to install Plastic & Brass Tight seal, adjustable height, strong flush! The IBERGRIF M20521 bottom/side inlet valve is a cost-effective and reliable solution. This valve features a G3/8-inch thread (16 mm) and an adjustable float valve height, compatible with both bottom and side inlet toilet tanks. Bottom and side entry cisterns Adjustable water level Brass threading instead of plastic threading Bottom fill valve Inlet pipe with filter design, can effectively filter impurities in water. With side inlet The bottom inlet can be used if the side inlet is screwed. If the bottom inlet is screwed, water can be fed through the side. Buoy regulation Adjust the buoy height to accurately control the water level, 5mm per scale. Adjustable rod Water speed can be controlled by rotating adjusting lever. Brass threading Hexagon fastening nuts with brass interface, compared with plastic threading, increase longer service life. Very convenient Easy to install and use, even girls can handle it. Durable seal, robust design & Unique innovative water cut-off structure fix slow, noise, leak.

Review: Sit on the throne - Great quality , easy to change the broken part on the old one with out needing to change the whole thing .
Review: Good quality - Good quality toilet flush. I've using it more than a year. Works quite nicely.

## Features

- Special note: The interface size of this product is G3/8 inches (16mm in diameter), not G1/2 inches. Please make sure the interface is compatible before purchasing.
- Two installation methods: Compared with traditional water tank inlet valves, we can support bottom or side inlet valves, suitable for integrated or two-piece toilets.
- Adjustable Height: Equipped with the main body latch, can adjust the water lavel, compatible with most dual flush toilet systems.
- Effective Clean: The inlet adopts the filter net to effectively filter the impurities in the water.
- Premium Material: Made of premium ABS material, rugged and durable, hexagon fastening nut made of brass material, the life has increased to 100,000 times.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BKSQ5VN1 |
| Best Sellers Rank | 75,877 in DIY & Tools ( See Top 100 in DIY & Tools ) 99 in Toilet Tanks |
| Brand | Ibergrif |
| Connector Type | Slip |
| Country of Origin | España |
| Customer Reviews | 4.4 out of 5 stars 6,414 Reviews |
| Exterior Finish | Brass |
| Exterior finish | Brass |
| Included Components | 1*toilet cistern fill valve 1* Water pipe 1*Instruction Sheet |
| Inlet Connection Size | 0.38 Inches |
| Inlet Connection Type | Tip solder at |
| Inlet connection size | 0.38 Inches |
| Inlet connection type | Tip solder at |
| Item Dimensions | 24.5 x 12.2 x 6.3 centimetres |
| Item Type Name | toilet cistern fill valve |
| Item dimensions L x W x H | 24.5 x 12.2 x 6.3 centimetres |
| Manufacturer | Ibergrif Griferias SL |
| Material | Acrylonitrile Butadiene Styrene (ABS) |
| Maximum Pressure | 16 Bars |
| Model Number | M20521 |
| Number of Pieces | 1 |
| Number of Ports | 1 |
| Outlet Connection Size | 0.38 Inches |
| Outlet Connection Type | G Connector |
| Part Number | M20521 |
| Set Name | Multi Color |
| Size | 13.3 cm x 28.5 cm x 6.9 cm |
| Smart Home Compatibility | Not Smart Home Compatible |
| Specification Met | CE, ISI |
| Thread Size | M13-17 |
| Thread Type | Metric, Pipe |
| Unit Count | 1.0 count |
| Valve Type | Float Valve |

## Product Details

- **Brand:** Ibergrif
- **Exterior finish:** Brass
- **Inlet connection size:** 0.38 Inches
- **Inlet connection type:** Tip solder at
- **Item dimensions L x W x H:** 28.5 x 13.3 x 6.9 centimetres
- **Material:** Acrylonitrile Butadiene Styrene (ABS)
- **Maximum operating pressure:** 16 Bars
- **Number of ports:** 1
- **Outlet connection size:** 0.38 Inches
- **Outlet connection type:** Barb

## Images

![Ibergrif M20521 Toilet Cistern Inlet Valve G3/8 Inch – Bottom or Side Entry - Image 1](https://m.media-amazon.com/images/I/61pN3q+ulsL.jpg)
![Ibergrif M20521 Toilet Cistern Inlet Valve G3/8 Inch – Bottom or Side Entry - Image 2](https://m.media-amazon.com/images/I/71uYyXb3HqL.jpg)
![Ibergrif M20521 Toilet Cistern Inlet Valve G3/8 Inch – Bottom or Side Entry - Image 3](https://m.media-amazon.com/images/I/61u0v932YhL.jpg)
![Ibergrif M20521 Toilet Cistern Inlet Valve G3/8 Inch – Bottom or Side Entry - Image 4](https://m.media-amazon.com/images/I/61kvPLUanPL.jpg)
![Ibergrif M20521 Toilet Cistern Inlet Valve G3/8 Inch – Bottom or Side Entry - Image 5](https://m.media-amazon.com/images/I/61UFz6ZuY-L.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: Is this suitable for high pressure?**
A: we have a high pressure water in our house and seems to work fine.

**Q: How long is the cable length?**
A: I didn't measure it but probably about 15cm.
Long enough to reach standard systern fitting.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Sit on the throne
*by J***N on 30 May 2026*

Great quality , easy to change the broken part on the old one with out needing to change the whole thing .

### ⭐⭐⭐⭐⭐ Good quality
*by R***K on 19 April 2026*

Good quality toilet flush. I've using it more than a year. Works quite nicely.

### ⭐⭐⭐⭐ European fitting.
*by A***R on 6 August 2024*

I have a standard Irish toilet and I wanted to get a push button system instead of a lever (young kids, struggling to use it). Saw this at a great price and said I'd try it. It arrived the next day (I have Prime) and I went about installing it. All was going well until I came to the coupling plate (the silver bit that connects the cistern to the toilet) because this kit does not include the plate, and the one that is used on standard Irish toilets is too small. I COULD NOT get a plate to fit over the new fitting in any local plumbing supplier (as it is a EURO size) so I had to improve and make the hole on the old one a bit bigger with the help of the hacksaw. Once I got this sorted, it was a breeze. It works really well but perhaps the button push is a tad on the hard side to push. All in all, it's good but be aware of the dreaded coupling problem.

## Frequently Bought Together

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-08-07*