Custom Quick-Disconnect Disposal Cans can be designed with up to eight fittings. You select the size, fitting material and position, and O-ring seal material to meet your needs. A minimum of two disconnect fittings are required, one intake and one vent. Unless otherwise specified, vent fitting on all cans will be the same as intake fitting. Stainless Steel Fitting for 3/8-in (10mm) ID tubing: Viton® seals with 1/4-in (6mm) flow.