Waterway 640-3580V 5-Inch White Suction Fitting Replacement for Waterway Super Hi-Flo Pool and Spa This super high flo spa suction assembly is a higher rating for use in self contained portable spas only This suction is designed to use a 3-3/8-inch hole in the spa shell with a Grommet gasket and 3-1/4-inch hole in the spa shell with a flat gasket This super hi-flo spa section has a 2-1/2-inch slip plumbing connection It is a great replacement for many older spa suctions Available in white color; measures 5-inch size