Thrust Bearings - Structured to withstand tension and stress for maximum durability. Pistons - PTFE surface treated for smooth, efficient operation. Valve, Shaft & Swash Plates - Designed with a lightweight aluminum alloy for added strength. O-Rings & Seals - OE-specified and compatible with both R12 and R134a refrigerants. Includes added factory-O-Ring installation kit to prevent leakage and ensure proper installation.