The Leybold Trivac B & BCS series pumps have rotatable intake and exhaust ports. These ports can be oriented horizontal or vertical and are attached with four socket head cap screws. An O-ring below the port seals it to the pump body. They are made of cast aluminum and are sometimes broken by accident. We sell these ports, 1 inlet or 1 outlet (sold as 1 each) as replacements. These NW/KF40 exhaust and intake replacements fit the S40BCS, D40BCS, S65BCS and D65BCS Leybold Trivac vacuum pumps. Leybold part number ES20009215.