Reltech PR125 Pump - Astralpool CTX 360 Retrofit - 1.25hp
Reltech PR125 Pump - Astralpool CTX 360 Retrofit - 1.25hp is temporarily out of stock and will ship as soon as it's available.
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Reltech PR125 Pump - Astralpool CTX 360 Retrofit - 1.25hp
Reltech PR125 Pump - Astralpool CTX 360 Retrofit - 1.25hp is temporarily out of stock and will ship as soon as it's available.
The Reltech PR125 1.25HP pool pump is a high-quality AstralPool CTX 360 retrofit pump, commonly used as a replacement for older AstralPool and Hurlcon pump models where a strong, reliable single-speed pump is still preferred.
Australian made. Not a cheap Chinese knock-off.
The Reltech PR Series is Australian made and built for harsh local conditions. These are not cheap generic Chinese knock-offs. They are proper Australian-made pumps from a long-established manufacturer with deep roots in the local pool industry.
Reltech originally made the plastic wet-end parts for Hurlcon prior to Hurlcon becoming AstralPool. That history is one of the reasons the PR125 is such a well-known and logical retrofit choice for older Astral and Hurlcon pump installations.
If you are replacing an older AstralPool CTX 360, CTX360, CTX 360C, CTX360C, CTX 360C MKII, CTX360C MKII, or some related older Astral / Hurlcon pump models, the PR125 is one of the most commonly used retrofit options in Australia.
Common Replacement / Compatibility References
This pump is commonly searched for or matched against the following model references:
- Reltech PR125
- Reltech PR 125
- PR125 pump
- PR 125 pump
- Premium PR125
- Premium PR 125
- AstralPool CTX 360
- AstralPool CTX360
- Astral CTX 360
- Astral CTX360
- AstralPool CTX 360C
- AstralPool CTX360C
- CTX 360C
- CTX360C
- AstralPool CTX 360C MKII
- CTX 360C MKII
- CTX360C MKII
- Hurlcon CTX 360
- Hurlcon CTX360
- Hurlcon CX series
- Hurlcon TX 1.25
- TX 1.25
- TX1.25
- Oasis P320
- Oasis P 320
- P320 pump
- P 320 pump
- Astral E Series pump
- E Series pump
Why Buy a Reltech Instead of a Cheap Generic Import?
- Australian made
- Built for Australian conditions
- Not a cheap Chinese knock-off
- Longstanding Australian pool industry history
- Proven retrofit option for older AstralPool and Hurlcon pumps
- Strong pressure performance for filtration, solar, and more demanding systems
- Reliable, serviceable, and well known in the Australian market
What This Pump Is Good For
- Standard residential pool filtration systems
- Swimming pools needing strong water flow and good head pressure
- Older Astral / Hurlcon pump replacements
- Solar pool heating systems where pressure matters
- Medium to larger in-ground pools
- Large plunge pools and some swim spa circulation setups
- Installations using either 40mm or 50mm PVC connections, depending on the setup
Why Many People Choose the PR125 as a CTX 360 Retrofit
- Popular replacement for CTX 360 / CTX360 / CTX 360C pumps
- Strong high-head performance for demanding pool systems
- Australian-made quality
- Large strainer basket for reduced cleaning frequency
- Clear lid for fast visual basket checks
- Service-friendly union-style connections
- Good balance of performance, durability, and noise levels
- Suitable for both 40mm and 50mm PVC pipe connection setups
Important Retrofit Notes
Retrofit does not always mean every old pump will be 100% identical in every measurement, cable position, or union arrangement. In this context it generally means this pump is commonly used to replace the same class and plumbing footprint of older pumps such as the CTX 360 and related models, usually without major plumbing changes.
Online compatibility references for the PR125 commonly point to Astral CTX 360 / CTX360 / CTX 360C MKII, and broader PR125 references also list older Astral CTX, CX, TX, P320 and E-Series pump families. As always, check your existing pump label and plumbing before ordering.
That said, we still recommend checking:
- Union style and thread type
- Centreline height and available equipment space
- Pipe size at suction and discharge
- Electrical supply suitability
- Whether your old pump was a true 1.25HP unit
If you are unsure, compare your existing pump label and photos before ordering.
Specifications
- Model: Reltech PR125 / PR 125
- Series: Premium PR Series
- Horsepower: 1.25HP
- Voltage / Phase: 240V / 1 Phase
- Full Load Amps: 4.97A
- Watts Input: 1150W
- Flow Rate: approx. 330 LPM at 8m head
- Maximum Noise: approx. 62 dBA at 1 metre
- Pump Length: approx. 610mm
- Approx. Overall Height: 341mm
- Approx. Width: 252mm
- Port Suitability: 40mm or 50mm pipe connection setup
- Power Lead: 2m flex with 10A 3-pin plug
- Warranty: 3 Year Limited Warranty
Construction & Features
- Heavy-duty one-piece pump body
- Corrosion-resistant and UV-resistant engineering grade thermoplastic construction
- Continuous-duty motor
- Built-in thermal overload protection
- Stainless steel pump shaft
- High-performance silicon carbide mechanical seal
- Extra-large robust strainer basket
- Easy-remove clear inspection lid
- Low-noise operation
- Designed for strong flow with good pressure
- Quick-connect couplings for easier installation and servicing
Common Search Terms
This product may also be searched as:
Reltech PR125 pump, Reltech PR 125, PR125 pool pump, PR 125 pool pump, Premium PR125, Premium PR 125, AstralPool CTX360 replacement, Astral CTX 360 retrofit pump, Astral CTX360 replacement, AstralPool CTX 360C replacement, AstralPool CTX 360C MKII replacement, Hurlcon CTX 360 replacement, TX1.25 replacement pump, Oasis P320 replacement pump, 1.25HP pool pump Australia, Australian made pool pump, CTX 360 retrofit.
Who This Pump Suits
This pump suits pool owners wanting a quality single-speed replacement for an older Astral / Hurlcon pump without dropping into a cheap unknown import. It is especially popular where people want to keep a familiar style of pump with proven pressure performance for filtration, solar, and general circulation duties.
Please Check Before Ordering
Because older pumps were sold over many years and under multiple brand names, always check your existing pump label, horsepower, plumbing size, and overall footprint before purchase. Some older installations may have been modified over time.
If you are replacing a CTX 360 / CTX360 / CTX 360C / CTX360C / CTX 360C MKII / CTX360C MKII / Oasis P320 style pump, this is one of the main retrofit options people look for.
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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PS RAP-10-91013