Reltech PR75 Pump - Astralpool CX 190 Retrofit - 0.75hp
Reltech PR75 Pump - Astralpool CX 190 Retrofit - 0.75hp is temporarily out of stock and will ship as soon as it's available.
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Reltech PR75 Pump - Astralpool CX 190 Retrofit - 0.75hp
Reltech PR75 Pump - Astralpool CX 190 Retrofit - 0.75hp is temporarily out of stock and will ship as soon as it's available.
The Reltech PR75 0.75HP pool pump is a high-quality AstralPool CX 190 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Reltech originally made the plastic wet-end parts for Hurlcon prior to Hurlcon becoming AstralPool.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 PR75 is such a well-known and logical retrofit choice for older Astral and Hurlcon pump installations.
If you are replacing an older AstralPool CX 190, CX190, Hurlcon CX 190, or some related older Astral / Hurlcon pump models, the PR75 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 PR75
- Reltech PR 75
- PR75 pump
- PR 75 pump
- Premium PR75
- Premium PR 75
- AstralPool CX 190
- AstralPool CX190
- Astral CX 190
- Astral CX190
- Hurlcon CX 190
- Hurlcon CX190
- Hurlcon CX series
- Astral CTX series
- Hurlcon TX series
- Astral P320 series
- Astral E Series pump
- E Series pump
- 0.75HP pool pump
- 3/4HP pool 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
- Smaller to medium swimming pools needing reliable water flow and good head pressure
- Older Astral / Hurlcon pump replacements
- Solar pool heating systems where pressure matters
- Plunge pools and smaller in-ground pools
- Installations using either 40mm or 50mm PVC connections, depending on the setup
Why Many People Choose the PR75 as a CX 190 Retrofit
- Popular replacement for CX 190 / CX190 pumps
- Strong high-head performance for its size
- 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 CX 190 and related models, usually without major plumbing changes.
Online compatibility references for the PR75 commonly point to older Astral / Hurlcon CX pump families, and broader PR-series references also list retrofit crossover into older Astral CTX, CX, TX, P320 and E-Series pump families. As always, check your existing pump label and plumbing before ordering. :contentReference[oaicite:1]{index=1}
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 0.75HP unit
If you are unsure, compare your existing pump label and photos before ordering.
Specifications
- Model: Reltech PR75 / PR 75
- Series: Premium PR Series
- Horsepower: 0.75HP
- Voltage / Phase: 240V / 1 Phase
- Full Load Amps: approx. 3.3A
- Flow Rate: approx. 190 LPM at 8m head
- Pump Length: approx. 610mm
- Port Suitability: 40mm or 50mm pipe connection setup
- Power Lead: 2m flex with 3-pin plug
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
- 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 PR75 pump, Reltech PR 75, PR75 pool pump, PR 75 pool pump, Premium PR75, Premium PR 75, AstralPool CX190 replacement, Astral CX 190 retrofit pump, Astral CX190 replacement, Hurlcon CX 190 replacement, Hurlcon CX190 replacement, 0.75HP pool pump Australia, 3/4HP pool pump Australia, Australian made pool pump, CX 190 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 CX 190 / CX190 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-10-91016