Aqua-Flo XP2 2.5HP - 1-Speed Flo-Master - Spa Jet Booster Pump - NLS
Aqua-Flo XP2 2.5HP - 1-Speed Flo-Master - Spa Jet Booster Pump - NLS - Spatex SX250 - Replacement / AMP - Balboa Davey SpaQuip Gecko is backordered and will ship as soon as it is back in stock.
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Aqua-Flo XP2 2.5HP - 1-Speed Flo-Master - Spa Jet Booster Pump - NLS
Aqua-Flo XP2 2.5HP - 1-Speed Flo-Master - Spa Jet Booster Pump - NLS - Spatex SX250 - Replacement / AMP - Balboa Davey SpaQuip Gecko is backordered and will ship as soon as it is back in stock.
- The OEM Aquaflo pumps were discontinued several years ago. This is the best replacement pump for the obsolete XP2 models.
- The plumbing aligns perfectly and uses the same threaded unions.
- Made by Spatex - the leaders in Australian Spa Equipment for over 30 years.
- Remove any old motor mounts / studs from base of spa to mount new pump.
- 2-Year Warranty
Your old pump may have these numbers:
XP2-902513 M 93546590 No. 244802260507 A452X582A6100, XP2-802513, 93556590 (2.5HP). Pump Mod: 07040001-6, 06025834-6, Code 03337, No G39H3720
Spa Industries APUM42152A is 2.5HP 1-Speed
- Supercedes all XP2 Pumps with the Century LASAR Pool/Spa Motor with AO Smith motors.
Specifications:
- Flo-master XP2
- 2.5HP - 1.9kW / 4.8BHP
- 50mm Std Fine Thread Unions
- EMG Elettromeccanica
- Length: 380mm / Width: 200mm / Height: 197-235mm
- 2"/50mm FBT Thread - measures ~78-79mm OD on pump
Notes about Horsepower Ratings:
- 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.
- Standard Australian HP ratings are calculated purely on input power in Watts, which are then converted to HP. (1HP=745.7Watts).
- You can always measure (with an Amp Meter) the input current 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. The problem here, is some spa manufacturers used slightly misleading ratings here as well, eg, they'd use a locked-rotor Amperage draw, etc. You'll see how the Amperage ratings and the HP labels don't match up.
- 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.
- Basically the labels can appear to be very different in regards to the pump's actual HP rating.
Examples: Some Balboa Pumps marked "4HP" is actually a 2HP pump in Australian terms. Some Aquaflo Pumps labelled as 4.8BHP are 2.5HP in Australian terms.
In plumbing, named sizes are not the actual measurements. A pipe called “50mm” or “2"” does not measure 50 mm across. Instead, it follows nominal sizing, an internationally-standardised naming system.
Use the Outside Diameter (OD) to check your pipe against fittings. Below is a quick reference for common spa & pool pipe sizes:
| Imperial Name | Metric Name | Pipe Diameter (OD) |
|---|---|---|
| 1/2" | 15mm | ~21.2–21.5 mm |
| 3/4" | 20mm | ~26.6–26.9 mm |
| 1" | 25 mm | ~33.4–33.7 mm |
| 1.5" | 40 mm | ~48.1–48.4 mm |
| 2" | 50 mm | ~60.2–60.8 mm |
| 2.5" | 65 mm | ~75.2–75.5 mm |
These are nominal sizes and are designed to fit matching fittings — not to measure exactly what their name suggests. These are based on PVC Pressure Pipe AS/NZ 1477 Dimensions1.
- º Internal diameters vary slightly by manufacturer and class.
- 1 Not all pool/spa fittings match these dimensions exactly. Some do not follow Australian or international standards. Chinese spas may use proprietary fittings.
Understanding Plumbing Sizes & Nominal Measurements
Plumbing sizes can be confusing. PVC and many other pipe systems use nominal sizes—the size is a name, not the exact measured dimension. This convention is used across most pool and spa systems so that pipes and fittings remain compatible.
Why pipe sizes don’t match the measurements
The Nominal Pipe Size (NPS) system standardises pipe dimensions so that pipes, fittings, valves, and accessories interoperate. Plumbers work with these nominal names every day, but DIYers can be tripped up if they try to match by a tape-measure alone.
How to Measure Pipe Correctly
-
Pipe size is identified by:
- The pipe’s Outside Diameter (OD).
- The fitting’s Inside Diameter (ID) (socket opening).
- Pipe Class / Schedule (e.g., Class 9, 12, 18 or Sch 40) relates to wall thickness and therefore the Internal Diameter (ID) and pressure rating.
- The outside diameter of a fitting is not useful (wall thickness varies by manufacturer).
Hose & Tube Dimensions
Common flexible hose sizes used in pool/spa systems (approximate IDs).
| Imperial Name | Metric Name | Inside Diameter (ID) |
|---|---|---|
| 3/8" | 9–10 mm | ~9 mm |
| 3/4" | 19 mm | ~19 mm |
BSP – British Standard Pipe Thread Sizes
BSP thread names are also nominal. The thread OD will not equal the nominal name.
| BSP Thread Size Naming | Outside Diameter (mm / inch) | TPI |
|---|---|---|
| 1/16" BSP | 7.7 mm / 0.304" | 28 |
| 1/8" BSP | 9.7 mm / 0.383" | 28 |
| 1/4" BSP | 13.16 mm / 0.518" | 19 |
| 3/8" BSP | 16.66 mm / 0.656" | 19 |
| 1/2" BSP / 15 mm | 20.99 mm / 0.825" | 14 |
| 5/8" BSP | 22.99 mm / 0.902" | 14 |
| 3/4" BSP / 20 mm | 26.44 mm / 1.041" | 14 |
| 7/8" BSP | 30.20 mm / 1.189" | 14 |
| 1" BSP / 25 mm | 33.25 mm / 1.309" | 11 |
| 1-1/4" BSP | 41.91 mm / 1.650" | 11 |
| 1-1/2" BSP / 40 mm | 47.80 mm / 1.882" | 11 |
| 2" BSP / 50 mm | 59.61 mm / 2.347" | 11 |
| 2-1/4" BSP | 65.71 mm / 2.587" | 11 |
| 2-1/2" BSP | 75.18 mm / 2.960" | 11 |
| 3" BSP | 87.88 mm / 3.460" | 11 |
| 4" BSP | 113.03 mm / 4.450" | 11 |
| 5" BSP | 138.43 mm / 5.450" | 11 |
| 6" BSP | 163.83 mm / 6.450" | 11 |
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SX250 - AMP