Waterway Executive, 2-4 Horsepower Pump. This is the premier high output, under spa-skirt pump of the millenium. Incredible output pressure. The 4HP version is used in many different applications with jet configurations of up to 26+ standard jets! This pump  is available with a 2.5" (pvc) suction (3 5/8" thread diameter), 2.0" (pvc) discharge, (3" thread diameter).  

Note that your pump may say 5 HP, (5 horsepower) but what you want is actually a pump voltage and amperage rating that closely matches yours. This is an unfortunate consequence of marketing horsepower in this industry.

  Misleading, but you can get the right pump simply by selecting the 4HP option. Any questions regarding pump selection please call us! Choose your configuration from the options below.

Often found with the 'Niagara' model label.

Note: This pump in the .75 HP two speed version makes a great replacement for baptistry heater pumps, especially using low speed for smooth, quiet operation

This is a brand new full size, heavy duty rated 56 Frame pump.
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This is a direct drop in replacement for Cal Spas 4HP pumps.  Yours may say 4 BHP, with a 10 amp motor.  However this is a boosted version producing a little more output volume.  Comes completely assembled with wet end as shown.

Rated at 13 Amps High Speed, 3.7 Amps Low.

230 Volts, 2 Speed, 3450/1725 RPM.

If you've got a Dimension One Spa with this pump, then this is the one you're looking for.

With such limited flex in the spa union connectors, a genuine Sta-Rite Durajet 2" pump is the only one that will fit perfectly in place.  

Rated 230 Volts, 2 speed, at a full 12 amps, this pump will easily mount in your D1.