I'm planning to make a modified version of the Ultimate Sparge Arm as shown on Morebeer.com: Link
In the build, they use some kind of check ball/valve to prevent back flow, looks like it's 1/2".
Anyone know where I can buy such a valve? Also, what should be the cracking pressure? When recirculating during mashing the pressure going through the check valve would be fairly low.
Thanks for any help!