Beeman P1 / Weihrauch HW45, Piston Seal,-Made of PTFE, "Note: Dry Fire several times after installation to seat the seal, takes about a tin of pellets before seal is run in." "TIPS FOR INSTALLATION", Check your old Seal for cuts, after removal, if you find any, it would be a good idea to Hone the Compression Tube, burs can develop in the compression tube slots cause by spring torsion on the piston against the tips of the Charging handle Arms over time, No sense installing a New Seal if it's going to be cut during installation. Apply a White Silicone Grease lightly on the Seal and a little just inside the Compression Tube, this will make the Piston go back in much easier, and remember to use that grease sparingly.        ------ -  Questions and Comments are Welcome, Thanks for Looking
 

This listing complies with’s air gun guidelines found here and I will only sell and ship air guns to buyers in jurisdictions where permitted by applicable laws 
http://pages.ebay.com/help/policies/firearms-weapons-knives.html {e123546-952593x}

Note: If you're looking for 7" x 10" Mini Lathe parts that I don't have listed, contact me, all I need is a part number and I can give you a price quote. Thanks