The BOSTON Large Multifit Plug takes the guesswork out of choosing a plug size. This multifit plug is made from quality white PVC, suiting sinks, baths and laundry tubs with an waste size of 50-60mm. If measuring your drain opening, this plug suits drain opening sizes of 53-63mm. The plug core is 53mm, with a larger top of 74mm, enabling it to suit more than one drain size. See images for measurement guide.