Bulkreefsupply.com carries six sizes of Uniseals ranging from 1/2" to 2" in diameter. Uniseals are rubber-like and are great to use when a bulkhead will not work, especially when trying to attach a pipe to the curve side of a bucket, drum or even another pipe. To make drilling the holes easy, we carry a 16 piece Hole Saw Drill Bit Set to fit all the Uniseal sizes.