I have a hand pump that I use to pump air out of things with and the plastic valves that I use keep failing eventually. Either from being under too much pressure, or from being under pressure for too long. I guess there's like a diaphragm in the valve that weakens and begins to leak. Here's an example of the valves that I've been using. http://www.ebay.com/itm/3-8-Kynar-V...Parts_Accessories&hash=item19b6caf365&vxp=mtr It needs to be that big to fit the hand pump, but I guess I could rig something up to make it work if I had a valve of a different size. Apparently those valves are too weak. Does anyone here know of an alternative that I could use? There's metal ones listed on ebay, but that could just be the outer covering with the diaphragm inside being exactly the same. Anyone know? Thanks.