Hand pump plastic valves keep failing under pressure

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leroyjenkens
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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-Vinton-Check-Valve-for-HHO-projects-/110440936293?pt=Motors_Car_Truck_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.
 

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Check with a performance auto parts shop. They make inline valves like this for nitrous systems that would work I would think.
 
Go to mcmaster.com and type "air check valve" into the search box.