Bleeding brakes/clutch

[turbotalon1g]

I was looking up how some people do this without a fancy tool, and I saw a guy just using a one-way/check valve in a hose on the bleeder screw so that he could leave it open while bleeding the brakes.

Anyone know where I could score a valve that would be able to stand up again pressure and brake fluid?

I'm thinking just hardware store contraption should work, but I figured that someone on here might of come up with something already.

Thanks