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These stoppers can be used with a number of vacuum manifolds such as the AF-0060 and AF-0061. Supplied with one CG-305-116 #116 Viton O-ring, although we you may want to order more in case you lose it down the sink. The #15 stopper requires a CG-150-05 clamp and the #20 requires a CG-150-06 (clamps sold separately).