The Regulator Piston comes as an assembly that has a built in blow-off valve. Do not disassemble! Replace this part when air is venting out the back of the marker and you are shooting less than 300 FPS.
This part has been set to the stock higher pressure for the Level 10 bolt kit.
This part fits all RT style valves including - Classic RT, Retro, RT Pro, Emag, and X-valves.