Astralpool Hurlcon Astralpool HX JX Gas Heater Seal Kits and Parts
Astralpool Hurlcon Astralpool HX JX Gas Heater Seal Kits and Parts - HX/JX Heaters - Complete Bypass & Seal Kit is backordered and will ship as soon as it is back in stock.
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Don't Guess - Ask Us!
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Astralpool Hurlcon Astralpool HX JX Gas Heater Seal Kits and Parts
Astralpool Hurlcon Astralpool HX JX Gas Heater Seal Kits and Parts - HX/JX Heaters - Complete Bypass & Seal Kit is backordered and will ship as soon as it is back in stock.
Astralpool
Seal Kits for all Astralpool / Hurlcon HX, JX, WX gas heaters. Fixes common leaks on Hurlcon and Astral pool gas heaters. Suits all HX 70, HX 120, HX 150, JX 130, JX 160 & WX (Wilton) Gas Heaters. Genuine OEM parts.
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Shipped Fast or can be Picked Up
Important Note: When installing the Bypass Kit, the round disc must be accessed from the outlet side of the water plumbing. Please ensure that all surrounding pipework is carefully repositioned to prevent the disc from accidentally falling into the plumbing system.
These parts fit the following Hurlcon and Astralpool gas pool heaters:
- HX 70 / HX 120 / HX 150
- JX 130 / JX 160
- WX 70 / WX 120 / WX 150
The Bypass & Seal Kit Comes with:
- 1x Plunger for Bypass Assembly
- 1x O-ring for Bypass Assembly
- 1x Disc for Bypass Assembly
- 1x - Bypass Spring
- 2x Split Pins
The HX/JX Complete Seal Kit Comes with:
- 2x Heat Exchanger Adaptors & O-Rings
- 1x Plunger for Bypass Assembly
- 1x O-ring for Bypass Assembly
- 1x Disc for Bypass Assembly
- 2x O-rings for Barrel Union -
- 2x Santoprene Gaskets (O ring) for adaptors
- 1x Bypass Spring
- 2x Split Pins
76025, 70007, 76026, 75109, 70003,71922,76025, 70007, 76026, 71922, 76030, 70002
Manufacturer Catalogues, Diagrams & Part Numbers
Need exploded views, spare part numbers, product numbers, diagrams, or more product information? See the manufacturer catalogues: AstralPool Catalogue 2026 | Zodiac Catalogue 2026
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
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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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75109 x 2 / 76001 x2 / 76030 x2 / 76021 x1 | 71922 x1 | 70002 x2 | 76040 6x (Split Pins)