Aquaflo Circ-Master HP Replacement - SXC35/WTC50 Circmaster Kit (CMHP / CMCP / Emerson)
Aquaflo Circ-Master HP Replacement - SXC35/WTC50 Circmaster Kit (CMHP / CMCP / Emerson) - is temporarily out of stock and will ship as soon as it's available.
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Don't Guess - Ask Us!
Not sure if it’s the right part? Send us a message and a photo of what you’re replacing, or what you need, and we’ll help make sure you get the right part the first time.
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Delivery and Shipping Info*
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Aquaflo Circ-Master HP Replacement - SXC35/WTC50 Circmaster Kit (CM...
Aquaflo Circ-Master HP Replacement - SXC35/WTC50 Circmaster Kit (CMHP / CMCP / Emerson) - is temporarily out of stock and will ship as soon as it's available.
The SXC35/WTC50 Circmaster Kit is the most direct drop-in replacement on the market for the discontinued Aquaflo Circ-Master HP (CMHP / CMCP) spa circulation pump. The included split-union adapters let the SXC35 fit straight into the original Circmaster plumbing — usually with enough give in the existing pipework to screw on without any modification.
Free Shipping, or Pickup. We keep these physically in stock for fast shipping or local pick-up, unlike most drop-shipping websites.
Aquaflo's Circ-Master CMHP/CMCP was discontinued after a long run, leaving thousands of spas needing a sensible drop-in replacement. The SXC35/WTC50 Circmaster Kit was purpose-built for exactly that job — similar footprint, plumbing within millimeters, modern motor.
What's in the Box
- SXC35 or WTC50(m) Spa Circulation Pump (1/3HP / 250W)
- 2× Aquaflo Circmaster union adapters for direct retrofit (within mm)
- Pre-fitted power lead — choose plug type from options.
- AMP - for Balboa, Davey, Spaquip, Spanet, Some Gecko Aeware
- 3-pin C38 - for standard Australian 10a power points.
- Mini JJ and Gecko in.link plugs no longer available - use old lead or get electrician to make electrical terminal box to adapt.
SXC35 Pump Specifications
- Power: 0.35HP / 250W / 1/3HP
- Voltage: 220-240V, 50Hz, 1A
- Max flow rate: 340 L/min
- Motor: 1400 rpm, 4-pole, extremely efficient
- Plumbing: 1.5" FPT thread, 55mm ID collar to slip over existing pump male tail
- Sound: Quiet running
- Warranty: 2 years (excluding chemical damage)
Best Replacement For
- Aquaflo Circ-Master HP / CMHP / CMCP / CMXP (Emerson / Australian-spec Circmaster pumps)
- Spa Industries EcoSpa / EcoSpa 1 circulation pump (APUMC1552A, APUMC1562A)
- Many WWDG, SpaPro, Sapphire, Alpine, Oasis, Vortex and similar imported builds that originally shipped with a Circmaster
Before You Buy: Quick Fitment Checklist
- Orientation & space: Check whether your suction and discharge line up. The union adapters allow some rotation variance, but very rigid pipework may need a gentle tweak with a heat gun. Check pump dimensions in diagram to ensure this will fit in your spa.
- Remove any motor-mounting studs or blocks. As with any updated motor, these may need to be modified.
Common Names & Part Numbers & References:
- CircMaster / Circ-Master, CMCP, CMHP, CMXP
- Emerson motor references: 1563 Spa Motor, K55MYGRD-8367, K55MYKHF-9557 (and variants)
- Spa Industries: APUMC1552A, APUMC1562A
- Sundance / Jacuzzi refs: 6500-911, 02410512-2
- Aquaflo refs (sample): CMHP-550114, 06040000-2, 02410004-2, 02410004-2510, 02410004-2, (plus many superseded codes)
- Also referenced as: Waterway Iron Might (in some listings)
Compliance note (AU): If you're shopping elsewhere, make sure any electrical pump supplied into Australia is properly approved and compliant. Non-approved units can be a safety and insurance headache.
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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SXC35-C38-AMP w/ 2x g0800-500028-k