Valterra 200-C10 PVC Swing/Spring Combination Check Valve, Clear, fits 1" PVC pipe

Functions very well and sealed with 1" flex PVC. I am using these on an aquarium and it did reduce the flow from the pumps quite a bit. If I had to buy again, I would get one with a swing/flapper design only.

This thing leaks so it's pointless.

I have the valve installed vertically and the swing always seems to get stuck open allowing backflow. It'll work for a couple days, then jam up again. Take apart, clean, repeat. Not happy.

Works great as a check valve for my aquarium sump but noticeably reduces flow rate. I remove the spring and turned it into a gravity hatch valve and it works flawlessly.

Buena calidad del producto, pero no lo recomiendo para acuario marino, tiene un resorte metalico