I have not tested it yet. I'm not in a rush anymore. I have my fish and corals at coral collection. The shop is on my way home from work so I can check in each day. I'll test today and if its OK I'll buy a damsel and but it inside my frag tank.
Check it out at Mcfadden-Dale hardware store near by Coral Gazers area or 2925 E. La Palma Ave
Anaheim, CA 92806! They have all check valves for schedule 40 and 80. You also can find the vacuum tubing with all sizes over there.