Whale check valve for 19 mm hose, 59416

I love it. I love it I love it I love it. It's perfect. My new 19mm shower drain pump hose fitted nicely over this check valve it and secured snugly with a lovely shiny jubilee clip on each end. Deeply satisfying and a thing of functional beauty. And what's genius about this is that it lets the water flow out one way, and not back the other. And behold my boat shower tray empties in seconds. Bob is your uncle and fanny is your aunt.

worked well - fitted an extra bilge pump to single hose. This NRV will prevent back filling

It just works

I used this non return valve to stop water from my upper pool draining back to a lower pool and it did an excellent job. It was easily inserted in my plumbing and only took a few minutes to install.

Works well.

Not very effective when used on my washing machine outlet. Just rubber flaps inside inside it and allowed sink and dishwasher water to pass back into my washing machine. Now changed to a mechanical pressure activated valve which works a treat.

It's very straight forward to use but you may want to use some boiling water to use on whatever pipe your using because it is a bit tight to squeeze on

Used it on my reef aquarium as a safety measure in event of a power cut, does not work, sump and floor flooded :(

This unit stops the constant cycles my bilge pump goes through lifting water 2.5 feet up and out

La compré porque decía que era 3/4 a 1 pulgada y no es cierto. Quizá de 1/2 pulgada si es, pero no me sirve. Terminé comprando una igual pero de 3/4.

So far so good. My garbage disposal was backing up food into my dishwasher for years and it was gross. I finally got around to installing this check valve which stopped it and I can’t believe I didn’t do this sooner. It was so simple. No leaks and works well

Works as described

Complete waste of money. Failed immediately, not very robust. Need to get a different type. Save your money and do not buy this.