Where to get a check valve

I bought a cheapy pump kit years ago. You know the kind, it’s more of a novelty item has a hole in the side of the cylinder as a pressure relief a guage less plastic hand pump. The hand pump is crap you can get a brake bleeder for 25 bucks at habor frieght. The cylinder is pretty good I put electrical tape over the relief hole. One problem is the check valve at the end never worked I have to leave the pump attached. Where can I buy a check valve I can hook to the hose

Post a photo of what you need. It’s impossible to understand exactly what you need. McMaster Carr has both male and female fitting; but, this may not be what you need.

Well since I don’t want to break what I have I want a check valve that I can put inline the hose, like a t