* This Product Oil-Less Piston Seal Ring ，It belongs to wear parts。 * Replacement parts Numbers:AB-9040019。 * Suitable for：Internal Diameter40mm External Diameter50mm of Cylinder bore。 * Suitable for Husky Bostitch Air Compressor :CAP60P-OF /CAP2040P-OF/CAP2000P-OF (Type 1and2)/ CAP1512-OF/CAP60PB-OF Model of 。