These new 1st stage rotor are for the Leybold D65B and D65BCS Trivac rotary vane dual stage mechanical vacuum pumps. We have included the exploded parts views below for download below. This is the rotor only, vacuum pump and accessories sold separately on this website. We also rebuild or repair your leaking or malfunctioning D65B and D65BCS vacuum pumps. These rotors have Leybold part number 32166165.