PCP Pump Piston (Brass)A PCP (Pre Charged Pneumatic) Pump Piston is a critical component of a high pressure air pump designed for filling PCP airguns. The piston is responsible for compressing air and generating high pressures, typically up to 3000 4500 psi, to fill the airgun's reservoir. Key features: Designed for high pressure applications and durability Typically made with materials like brass or high strength rubber Sealed with O rings or other high pressure seals for