Components included: The package contains a replacement bearing ring, essential O-rings, and heavy-duty valve seats. Seal Material: Features high-grade FKM (Viton-type) seals optimized for excellent resistance to heat, oils, and agricultural chemicals. Seat Material: Utilizes self-lubricating PTFE (Teflon) seats designed to prevent the ball mechanism from sticking or binding. Weight: Super lightweight at exactly 0.12 lbs.