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.