If you have a Crosman 760 Pumpmaster that doesn’t hold pressure or leaks while pumping then you could just rebuild it instead of replacing it. It’s quite a bit cheaper ($10) than a new air rifle.

The Crosman 760 Pumpmaster Reseal/Rebuild kit includes the following items:

1. check valve(#1322-056)
2. valve stem assembly(#1322A011)
3. pump head cup(#760-140)
4. Inner and outer valve body o-rings(#130-034, #130-035)
5. exhaust port seal(#130-036)

**** This kit will not work with pre 75 Crosman 760 air rifles.

Here’s a link where you can buy this kit…Crosman 760 Pumpmaster Reseal/Rebuild Kit at Amazon.com

Does your Daisy Powerline 880 pellet gun leak air or doesn’t hold a charge after pumping? You might need to rebuild the pneumatic system which entails replacing some seals. It’s fairly simple to do and doesn’t cost much. Here’s where to by the kit…Daisy Powerline 880 Rebuild Kit at Amazon.com

Daisy Powerline 880 Rebuild Kit

This kit is for the newer Daisy Powerline 880’s with the aluminum pump tube. The older models had the brass pump tube. The rebuild kit includes new O-rings for the pump tube and pump head, new O-ring for the exhaust valve, new foam oil wiper and a new pressure chamber seal assembly. This kit will make the 880 like new.