Pro1000 Waterfall Box - Pondmaster Pro1000 Waterfall box can handle pumps up to 950 gph. Has an 8" spill. Comes complete with 1.5" bulkhead fitting with 3/4" to 1.5" barb adapter. Measures 12" x 9" x 8". No Media waterfall spillway for greater aeration, includes stepped barb to accommodate 3/4",1",1/1/4",1 1/2". Perfect for small backyard or preformed ponds.