Genuine direct replacement Waterway 48 Frame pump Hi-Flo wet end with 2-inch plumbing union connections on both the inlet and outlet (78mm thread OD). The Waterway Hi-Flo wet end is a powerful yet compact wet end with a large-sized 4hp rated impeller. This type of Waterway wet end is found on 1.5hp and 2hp Waterway Hi-Flo hot tub pumps and they are Waterway’s most common European 48 frame pump. This Hi-Flo wet end can be found on Beachcomber spas, Spaform Hot Tubs & others.