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. Polypropylene Fitting for 3/8-in (10mm) ID tubing: This fitting is equipped with EPDM seals with 1/4-in (6mm) flow.