---
product_id: 13984711
title: "Prime-Line U 9842 Clear Lucite, Glass Surface Patio Door Lock, Self Adhesive (2 Pack)"
brand: "prime-line"
price: "€ 12.77"
currency: EUR
in_stock: true
reviews_count: 11
category: "Prime Line"
url: https://www.desertcart.hr/products/13984711-prime-line-u-9842-clear-lucite-glass-surface-patio-door
store_origin: HR
region: Croatia
---

# Clear Lucite design for discreet security Spring-loaded plunger lock for secure hold Strong self-adhesive backing, no tools needed Prime-Line U 9842 Clear Lucite, Glass Surface Patio Door Lock, Self Adhesive (2 Pack)

**Brand:** prime-line
**Price:** € 12.77
**Availability:** ✅ In Stock

## Summary

> 🔐 Lock in safety without sacrificing style—security you barely see but always feel.

## Quick Answers

- **What is this?** Prime-Line U 9842 Clear Lucite, Glass Surface Patio Door Lock, Self Adhesive (2 Pack) by prime-line
- **How much does it cost?** € 12.77 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/13984711-prime-line-u-9842-clear-lucite-glass-surface-patio-door)

## Best For

- prime-line enthusiasts

## Why This Product

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

## Key Features

- • **Dual-Purpose Safety Lock:** Blocks sliding doors fully or partially for flexible security.
- • **Invisible Yet Invincible:** Crystal-clear Lucite blends seamlessly with glass doors.
- • **Durable Hold in Any Climate:** Adhesive proven tough even in triple-digit heat.
- • **Effortless No-Tool Installation:** Stick & secure in seconds—no hardware hassle.
- • **Perfect for Family & Peace of Mind:** Keep kids safe and intruders out with confidence.

## Overview

The Prime-Line U 9842 Clear Lucite Patio Door Lock is a sleek, self-adhesive security solution designed for glass sliding doors. Featuring a spring-loaded plunger lock and clear acrylic construction, it installs tool-free and offers discreet, reliable protection. Ideal for families and renters, this 2-pack lock withstands extreme temperatures while preventing unwanted door movement, ensuring peace of mind with minimal visual impact.

## Description

This is a clear Lucite, two-piece hinged assembly with spring-loaded plunger lock. The clear adhesive handing securely blocks door in closed or ventilating position. No tools are needed to be installed properly. These locks are inconspicuous when installed. Each lock mounts to any glass surface of your stationary sliding glass window. Comes in a convenient 2 pack. Order your today.

Review: Perfect for keeping the door shut! - I love this! I'm going through construction on my house and its older so the sliding glass door latches and locks don't work. So essentially literally anyone could just slide the door open. I bought this to at least act as a buffer until the construction is over and its perfect! I have it so the door cant open more than an inch when its in use and it is super stuck to the door. I have even forgotten it was there and accidentally went to slide the door open with some force and it stopped the door right in its tracks and didn't budge or break. Very durable and very easy to use. Perfect for keeping people out or keeping little ones in.
Review: GREAT SAFETY PRODUCT! - I bought this to protect my three grandsons, ages 5yrs, 3 yrs, and 18mo. They just moved into a third floor apartment with a sliding glass door to a balcony. And, of course, they always wanted to go outside and play on the balcony. This little gadget was the perfect solution to keeping them from opening the door and heading outside without supervision. It took seconds to install, no tools required. Initially, I was concerned that the adhesive might not hold in the Arizona summer heat. But it has been over a month since I installed it, every day in the triple digits, and it is holding tight. The kids can't reach it, and it is easy for the adults to install and use. Great product!

## Features

- Self-adhesive back secures lock to glass surface
- Clear acrylic offers inconspicuous security
- spring-loaded lock pin
- Blocks door from moving when open
- Clean mounting surface thoroughly before installing

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001M1WQHQ |
| Additional Features | special_feature |
| Best Sellers Rank | #160,076 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #347 in Screen Door Hardware |
| Brand | PRIME-LINE |
| Brand Name | PRIME-LINE |
| Color | Clear |
| Control Method | Touch |
| Controller Type | Hand Control |
| Customer Reviews | 4.2 out of 5 stars 793 Reviews |
| Finish Types | Clear |
| Global Trade Identification Number | 00049793098429 |
| Included Components | Hardware, Door, Gate & Window Hardware, screen-door-hardware |
| Item Dimensions | 1.25 x 3.06 x 5.44 inches |
| Item Type Name | Security flip lock. |
| Item dimensions L x W x H | 1.25 x 3.06 x 5.44 inches |
| Lock Type | Rim Lock |
| Manufacturer | Prime-Line Products (Home Improvement) |
| Manufacturer Part Number | U 9842 |
| Manufacturer Warranty Description | Goods are warranted against manufacturing defects for 1 year. |
| Material | Lucite |
| Material Type | Lucite |
| Model Name | U 9842 |
| Model Number | U 9842 |
| Number of Pieces | 2 |
| Recommended Uses For Product | Home |
| Shape | shape |
| Smart Home Compatibility | Not Smart Home Compatible |
| Special Feature | special_feature |
| Style Name | Modern |
| UPC | 049793098429 |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** PRIME-LINE
- **Special Feature:** Keyless
- **Lock Type:** Rim Lock
- **Item dimensions L x W x H:** 1.25 x 3.06 x 5.44 inches
- **Material:** Lucite

## Images

![Prime-Line U 9842 Clear Lucite, Glass Surface Patio Door Lock, Self Adhesive (2 Pack) - Image 1](https://m.media-amazon.com/images/I/61MyCYbtqfL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect for keeping the door shut!
*by C***. on November 3, 2022*

I love this! I'm going through construction on my house and its older so the sliding glass door latches and locks don't work. So essentially literally anyone could just slide the door open. I bought this to at least act as a buffer until the construction is over and its perfect! I have it so the door cant open more than an inch when its in use and it is super stuck to the door. I have even forgotten it was there and accidentally went to slide the door open with some force and it stopped the door right in its tracks and didn't budge or break. Very durable and very easy to use. Perfect for keeping people out or keeping little ones in.

### ⭐⭐⭐⭐⭐ GREAT SAFETY PRODUCT!
*by H***S on September 8, 2009*

I bought this to protect my three grandsons, ages 5yrs, 3 yrs, and 18mo. They just moved into a third floor apartment with a sliding glass door to a balcony. And, of course, they always wanted to go outside and play on the balcony. This little gadget was the perfect solution to keeping them from opening the door and heading outside without supervision. It took seconds to install, no tools required. Initially, I was concerned that the adhesive might not hold in the Arizona summer heat. But it has been over a month since I installed it, every day in the triple digits, and it is holding tight. The kids can't reach it, and it is easy for the adults to install and use. Great product!

### ⭐⭐⭐⭐⭐ My go to lock for slider doors.
*by T***R on April 3, 2026*

These are my favorite locks for slider doors.

## Frequently Bought Together

- Prime-Line U 9842 Clear Lucite, Glass Surface Patio Door Lock, Self Adhesive (2 Pack)
- Sliding Glass Door Lock for Home Safety - 4 Pack Sliding Patio Door Locks, Child Safety Slide Window Stopper, Extra Strong Adhesive

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**Shop now:** [https://www.desertcart.hr/products/13984711-prime-line-u-9842-clear-lucite-glass-surface-patio-door](https://www.desertcart.hr/products/13984711-prime-line-u-9842-clear-lucite-glass-surface-patio-door)

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-06-23*