check valve

I have a 20 gallon tank on the ground with RODI water in it, and a neptune PMUP connected to an avast klak stirrer. I have a check valve on the 1/4" tubing from the PMUP to the stirrer so water does not flow back into the 20 gallon. However every few months my check valve stops working and the...

New in box Georg Fischer 1" Wye Check Valve $50 shipped

As pictured WYSIWYG Lots of parts, many bulkheads, three 1.5" clear swing check valves, pvc fittings, black and grey, screens, most 1.5" slip fittings, plus much more!

There's two valves I'd like to plumb horizontally. Can I achieve full syphon with a gate valve on a Herbie main drain, if the gate valve is plumbed horizontally? Will a Y-style check valve (pictured) still work properly, if plumbed horizontally? I believe this is also called a Wye Check Valve...

Are check valves worth using for plumbing systems such as the return line or should they be avoided completely?

Saltwater fish guy who has been in the hobby for 55 years. I am replacing a 120 with a new 120 ACRYLIC with the following: over the top overflow (no water line at top of tank but... introduces a new, minor problem). added 1-1/2" acrylic walls around the openings in the top to guide the water...

My recently installed new check valve is now bouncing until my returns are out of the water and no more water can drain into the sump from the display. It is brand new but I tried to clean it and it is no different. Obviously this check valve is faulty, but is there something I can do to make...

Hey everyone, thanks for looking at the thread and giving what advise you can. SO, I am building my first tank which will be a 180 gallon reef ready tank with a Trigger 39 underneath it. I am at the point of plumbing the tank and I've been seeing differing opinions on one piece of plumbing I am...

Custom Aquariums Granted Patent for the Siphon Stopper Emitter. Click the top like to learn more and watch the video. Click the 2nd like to see our Facebook page. http://aquanerd.com/2017/03/custom-aquariums-granted-patent-for-the-siphon-stopper-emitter.html...