SILCA INNER CHECK VALVE ASSEMBLYIf you have a Pista or Super Pista pump made after 1946, then it has this check valve assembly. This brass plunger design has high durability, contamination resistance, and solid sealing action. This check valve usually needs to be replaced every 20 to 25 years. The kit contains a brass plunger, O-ring, stainless steel spring and aluminum crush washer. Features Brass plunger design provides durability, contamination resistance, and solid sealing action The kit contains: brass plunger, O-ring, stainless steel spring, and aluminum crush washer Components manufactured in Italy and the USA | Silca | Inner Check Valve Assembly Valve Assembly