G.A. Murdock Mur-lok 1/4" Quick Connect One Way Check Valve NSF/ANSI 58 Component and NSF/ANSI 372 Certified by WQA

Works great what more can I say about a small plastic coupler

I relocated my countertop (carbon) water filter to under the counter. Bought this to solve a problem of back flow occurring, which caused warm water to seep into the filter (which is not a good thing!). The ultimate problem might be the bad diverter on my low-quality kitchen faucet, but this was a quick fix until I buy a good faucet.

Replaced a John Guest one way valve in my primary RO system. For some reason a lot of the JGs are noisy, they have a high pitched squeal. These are silent, and work as intended.

I used this to replace a JG valve which was noisy. I've had this one for 6 weeks and haven't heard any noises from our RO system.

Fits my RODI system and no leaks.

Fixed my RO drain from flowing backwards when my water filter backwashed.

I used on my well water chlorine system. My well water pump produces 50psi and the product was not able stop back pressure. I could prevent the reverse flow. I kept in the system because it help a little and the inside fell apart after a year.

Install gave me no trouble at all, and so far, it's been working great.