Quick Connect Check Valve Fitting

This check valve works flawlessly. I was having trouble with my very old 5 stage Mako system and really knew nothing about it's workings. The waste water was constantly running. After speaking with the engineering dept, They trouble shot my issues and let me tell you they are top notch, They explained how everything works . I got the system with my used 180 gallon reef tank and it was ancient. I ended up replacing everything. They walked my through the setup and my system a pretty much new now.