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ADJUSTABLE PISTON PACK FOR CROSMAN 1377 1322 P1377 P1322 2289 DRIFTER 362
You have your choice of a Pump Cup Piston or a Flat Top Piston.
Both styles feature valve improvements such as angled exhaust ports and polishing.
The brass kit will include the solid brass valve (again, either Flat Top or Pump Cup style), pictured here:
https://www.alliancehobby.com/flattop.htm
Aluminum Piston, Flat Top, 362
Brass Piston, Flat Top, 1377 1322 Drifter
Aluminum Piston, Pump Cup, 1377 1322 Drifter
These photos have set screws, which I have since decided against. The jam nut works well and is cleaner.
Short & Long Brass Flat Top Pistons against Aluminum Flat Top Valves
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