Anyone have any experience of this shutoff device actually successfully shuting off the water after leaked developed, preventing flooding?

I tested it and it works perfectly. But the shut off needs to be near the potential leak. If its too far away it wont get wet enough and wont expand the disk. Its a great invention. Get some extra disks and try yourself to make sure the set up is positioned well.

My tubing is 3/8, would this valve work?

This accepts 1/4” tube so no it won’t work. Unless you get two 3/8” to 1/4” couplers and some 1/4” tube then you can make it work.

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- Express Water Leak Stop Valve for Reverse Osmosis & Under Sink Water Filtration - Automatic Water Shut-Off Valve for Water Filtration Systems

Product ID: 81064965

Details

Material
Polypropylene
Product Dimensions
3"D x 2"W x
Item Weight
1.1 Ounces
Product Benefits
Automatic Shut
Brand
EXPRESS WATER

💧Instant leak detection

🔒Automatic water shut-off

⚙️Universal 1/4” quick-connect fittings

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NZ$105

Duties & taxes included

In stock

Sold byAmazon Cook IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Stop leaks before they start — your water’s silent guardian!

DURABLE DEPENDABLE - Crafted from robust polypropylene for long-lasting leak protection you can trust.
VERSATILE COMPATIBILITY - Works seamlessly with RO systems, coffee machines, ice makers, refrigerators, and more.
BONUS LEAK PADS INCLUDED - Comes with 3 reusable leak detection pads and mounting screws for multiple setups.
PLUG PLAY INSTALLATION - Universal 1/4” quick-connect fittings make setup effortless and tool-free.
LEAK DETECTION IN A FLASH - Stops water flow immediately upon moisture detection to prevent costly damage.

The Express Water Leak Stop Valve is a compact, automatic shut-off valve designed to detect moisture and instantly stop water flow, protecting your reverse osmosis and under-sink filtration systems from leaks. Featuring universal 1/4” quick-connect fittings, durable polypropylene construction, and included leak detection pads, it offers easy installation and reliable, multi-application leak protection for a variety of household water appliances.

Specifications

Material	Polypropylene (PP)
Product Dimensions	3"D x 2"W x 4"H
Item Weight	1.1 Ounces
Product Benefits	Automatic Shut Off When Leak Detected
Brand	EXPRESS WATER
UPC	641990962772
Global Trade Identification Number	00641990962772
Unit Count	1.0 Count
Number of Items	1
Manufacturer	Express Water
Part Number	PRTLKS14Q
Item Weight	1.1 ounces
Item model number	PRTLKS14Q
Is Discontinued By Manufacturer	No
Size	Small
Color	White
Power Source	Corded electric
Item Package Quantity	1
Measurement System	inch
Included Components	Leak Stop Valve
Batteries Included?	No
Batteries Required?	No

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