3711221-13 Waterway Spa Pump 1-speed, 230V, 10.0A Executive 56 frame 6.5" diameter 2"SD / 2.5" CS. High performance Water Way Hot Tub Pump, 2-1/2 inch intake/ 2.0"outlet, threads measure 3.7" outside diameter on inlet, 3.1" OD on discharge, very strong A.O. Smith motor, split capacitor design, double shielded ball bearings. Seals. Overall length=17" Rated 3.0HP 371122113 PF-30-1N22C PF301N22C Also available in 2 speed models and up to 5 horsepower. Please note that Waterway has been shipping these with a 2-speed motor which can be used on high speed only as a single speed pump. This is due to shortages of the single speed motors per Waterway.