Unique design drains faster, while eliminating unsightly thru-hulls.Innovative design generates vortex action for faster drainage.Side barbs available from 5/8" to 1-1/8" in all combinations.Moulded in high-impact super-tough Nylon.Size: Base: 1-1/2" BSP (M).Top: 1 x 1-1/2" barb and 2 x 1" barb.