Genuine Balboa Ultimax / Ultima / Vico Spa Jet Booster Pumps. This is the uncommon 1.5HP 2-speed pump. These supersede the older pumps. Balboa Water Group GG Industries. Comes standard with AMP plug. Made in the USA

• Replaces all older Superwow & Ultimax 1.5hp 2 Speed Pump. May have 1023024, P528216 or other parts numbers.

Installation Notes if Replacing a SuperWow pump:

• Use lubricant on pump thread due to a variance of the thread. Newer pumps have a tigher thread.
• Plumbing side is very similar, but in some cases it will need ot be modified.
• Motor mount is different. Remove mounting studs in spa and mount motor as necessary.

Balboa Pumps marked "4HP" & "3HP" are actually a 2HP pump in Australian spas. See notes below for explanation. 

These are a very common pump found on many Spa Industries' brands of spas. (Bullfrog, Signature, Leisurite, Designer, Lanark, SCS Industries, etc)  They were often 2-speed pumps with the low-speed wire clipped off, thus actually becoming single speed pumps. If your plug has one wire clipped off, ensure the new pump has the same done! 

Dimensions:

• 1.5HP Two-Speed: Length: / Height: / Width: 195mm
  
•  - measures ~78-79mm OD on pump

 Important Notes: 

• Some Spa Manufacturers use a complicated & confusing form of Horsepower measurement that was more commonly used in the USA, called hydraulic horsepower (HP=PSI*GPM/1714). It gives a more impressive appearance, and may give a false impression of performance. 
• Australian HP ratings are calculated purely on input power in Watts, which are then converted to HP. (1HP=745.7Watts). 
• Balboa & Aquaflo have both released pumps to spa manufacturers that use these confusing power ratings at the request of Spa Manufacturers. 
• You can always look at the input ratings and convert back to real HP.
• Rough HP measurement can also be calculated using Ohm's Law (V=IR).   These pumps also have an Amperage rating that can be roughly converted back to Watts, and then to Horsepower.
• Furthermore, HP ratings are not an ideal measurement of pump performance anyway! Pump flow curves, which measure flow per metre of head pressure are a far more reliable method of measuring pump performance, especially with the advent of variable-speed DC motors.

ha44ng um si 1.5hpr 2sp amp