Material：Made of durable PVC material which is no fade, crack and peel. Size: 47 mm x 70 mm, 1 inch; Color: gray; Applicable models: universal for most rain barrels, water tanks, ponds, or aquariums Easy to install: Threaded from the front to end, suitable for industrial and house using. It can be installed in water tank, storage barrel and rain barrels. Function: locking nut is reversed threaded; The Bulkhead Fitting with 4 mm thick silicon seal gasket that will contour to the shape of the round barrels You will get: 2 pieces 1 inch PVC bulkhead fitting in your package, sufficient to use them on your water tanks