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3721621-1D Waterway Spa Pump 2-speed, 230V, 12.0/4.4A ME-40226-20 Executive 56 frame 6.5" diameter 2" SD/CS. Threads measure 3.1" (3.065") outside diameter.
Part Number 3721621-1D, Model PF-40-2N22C, PF-30-2N22M, and others.
High performance Water Way Hot Tub Pump, very strong motor, split capacitor design, double shielded ball bearings. Viton Seals. Overall length=17" Labelled 4.0HP but often relabeled 5hp, 6hp, and even 7hp. 37216211d, P240E52024. Intake and discharge threads are same size as each other and 3.065" (3.1") outside diameter.
Overall length 16-7/8", height 9", width 8-1/4". Energy Efficient, labelled 4.0 HP, often marked by spa manufacturers as 6.0 BHP, which is the maximum brake horsepower it can produce. Spa Pumps, Hot Tub Pumps;
3721621-0D87, 3721621-0D36, 37216210D5ACT, 3721621-0D, 3Y21621-0D, 3721621-0D76, 3721621-1D5A, 3721628-0D85LB, 3721621-0D85CT, 3721621-0D76VK, 3721628-1D, 3721628-0D5A, 3721628-0D7G, 3721621-0D85, Niagara, Massage Master XLT, R63MWENA-4727
Order optional union fitting o-rings shown under Accessories for this product below.
Optional union fitting gaskets are available below in Accessories for this product.
Can be labelled by one of these 'model numbers', which do not completely define the product like a part number does: PF-40-2N22C, PF-40-2N22M, PF-40-2N22MC, PF-30-2N22C, PF-30-2N22M, PF-30-2N22MC, PF302N22C, PF-50-2N22C, PF402N22M, and if you go by the model number, please carefully verify your motor amps rating and the outside diameter of your intake and discharge threads. Any doubts, please email us a few photos and we will help verify for you. email to: [email protected]
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a great spa pump 
