A ball check valve is one of several different types of valves designed to permit the flow of material in one direction only.

A brass ball valve is made of forged brass and consists of rings and a ball with a handle which can be moved mechanically to control the flow in the pipe.

The lever on the ball valve operates freely, but it doesn't feel like anything is moving, and the water flow to the strainer doesn't stop completely.

A check vavle prevents water from syphoning back from the main tank into the sump. Not always needed if the sump is set up propperly.

A ball valve is a valve with a spherical disc, the part of the valve which controls the flow through it.

My new-to-me old boat, on my first sail across the Sea of Cortez, she began filling the bilge about the 3rd day out of San Carlos enroute to La Paz.

ON/OFF valve from size 4 up to 24 inch. Application is highly sour (H2S and CO2 and water and also a little CL). Material that costumer is ordered is A186 F6a for ball and also request for fully stell

2" PVC Ball valve. I noticed that it is difficult to turn the handle. On doing some reading on the web the difficulty in turning is an ongoing concern for many.