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Your cart is empty.Simplify your plumbing and home improvement projects with the John Guest Check Valve. This single check valve is manufactured from durable white polypropylene and equipped with EPDM o-rings that utilize John Guest's push-fit technology to make easy, reliable, leak-free connections. These valves have been developed to restrict the flow of liquids and other loose materials to one direction through a pipe or passageway quickly and easily. Push-to-connect fittings provide a simple, quick, reliable, and leak-free connection with no tools required. FDA-compliant material; NSF 61 and 51 certified
Kimberly H.
2025-08-30 11:10:04
I bought this to prevent backflow in the feed water to the Ro system. Works just as it should. We live in the country and the electricity goes off at times. Our well kicks on at 40 psi and off at 60 psi. The RO system runs from 20 psi to 40 psi. If the electricity goes off the well pressure could drop below 40 psi and the RO could backflow. This check valve is just a safety device and lends peace of mind. I would buy it again.
TBinNYC
2025-07-25 12:53:17
this check valve is a difficult item to find right now, and I had to pay up for it. but the John guest brand works flawlessly and it's definitely not worth taking the risk having a flood in your house by using one of the Chinese cheap knock offs..
MPag
2025-06-16 17:52:00
Works perfectly with no leakage.
toodaloo
2025-06-15 20:09:22
I use these on my iron filter.works great
R. S.
2025-06-14 09:53:59
Used this to prevent backflow on a commercial-grade condensate pump. We have a steam humidifier and so we have to use a pump rated for 212 degree water. The backflow valve that came with the pump was nightmare - horrendous chatter when pumping, then god-awful hammer (and total lack of backflow prevention) on shutoff.This pump uses 3/8†copper refrigerant line for its output and pumps at a very high rate. This John Guest fitting has been inline for several (peaceful!!) months now. It is utterly silent, adding no turbulence while pumping and providing instant shutoff with no hammering or backflow. Installation is a dream and no leaks or other problems so far.
Steve
2025-05-23 14:30:22
Didn't work for my project.
Gary H
2025-04-30 17:14:42
Price was high but this unit is listed as able to handle chlorine without damage. Purchased through Amazon and delivery was the next day.
Brandon
2025-03-21 11:40:44
This works but requires a good amount of pressure to open the valve to allow flow. I bought this for a low pressure drain tubing on my reverse osmosis water filter to prevent backflow from the drain pipe. I am sure it works fine for higher pressure scenarios, but I couldn't fully test.
Robinson D.
2025-03-14 13:09:45
Le descriptif dit 10 !!!!Recu seulement 1 ???
smudgley
2025-03-12 12:05:52
Save's my co2 regulator from getting liquid from kegs
Bernard
2025-01-14 14:16:11
just what I needed
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