Astralpool / Hurlcon Water Pressure Sensor Switch - Allied Innovations / Len Gordon
Astralpool / Hurlcon Water Pressure Sensor Switch - Allied Innovations / Len Gordon is backordered and will ship as soon as it is back in stock.
Delivery and Shipping
Delivery and Shipping
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OEM Genuine LG/AI Water Pressure Switch (Flow Switch) for all Hurlcon, Astralpool, INSNRG, Raypak, Pentair, Hayward gas heaters. Current version supersedes all older versions with Stainless Steel thread (that were known to get blocked by rust easily).
- Shipped Fast or can be Picked Up
- Always In Stock
Allied Innovations / Len Gordon. Exactly the same pressure switch found in Astralpool & Hurlcon heaters, but at a great price. Note that these have been discontinued by the manufacturer in the USA, so we bought all the remaining stock available.
Suits Astralpool, Hurlcon, Raypak, INSNRG, Pentair and many gas heaters that use the same 1/8" NPT thread.
Adjustable 1-5 PSI / 7-35kPa, with 1/8" NPT thread. Originally had stainless thread.
Installation Instructions:
- Ensure female thread of socket is clean and in good condition.
- Use small amount of thread tape or suitable thread sealant on male thread.
- Too much tape can damage both switch & socket
- Gently screw in by hand, ensuring not to cross-thread, or over-tighten. Breakage by over-tightening is not covered by warranty. Threads are tapered.
- Adjust pressure switch as per manufacturer's instructions. Simply slide the black locking toggle upwards to allow adjustment wheel to rotate. You may need a pair of pliers to slide toggle upwards.
Used in the following equipment, plus many more:
-
Hurlcon & AstralPool: Part # 71580 (OEM) 800122-3
- HX 70, HX 120, HX 150, MX 150, MX 200, MX 250, MX 300, MX 350, MX 400, MX 500, JX 130, JX 160, HiNRG 175, HiNRG 250, HiNRG 400, Viron 250, Viron 350, Viron 450, Viron 550, WX 70, WX 120, WX 150, ICI 200, ICI 400,
- Jacuzzi and many more.
- Also used in Astral BPM and BPA heat pumps - BPA 400, BPA 600, BPA 700, BPA 800, BPA 900, BPM 400, BPM 600, BPM 700, BPM 800, BPT 900 and other BP series heaters.
-
Raypak: Part # 56651284
- 131 Gemini, Raypak 200, Raypak 280, Raypak 350, Raypak 430, all RP2100 heaters, and almost all others. (may require 1/8" NPT thread tap and/or Brass Tube Fitting)
- 131 Gemini, Raypak 200, Raypak 280, Raypak 350, Raypak 430, all RP2100 heaters, and almost all others. (may require 1/8" NPT thread tap and/or Brass Tube Fitting)
-
Pentair: Part # 42001-0060s
- Mastertemp 125, Mastertemp 200, Mastertemp 300, Mastertemp 400
- Waterco Turbotemp 125, Waterco Turbotemp 200, Waterco Turbotemp 300, Turbotemp 400, Sta-Rite Max-E-Therm 125, Max E Therm 200, Max E Therm 300, Max E Therm 400
-
INSNRG: Part # 8001403
- GI 160, GI 265, GI 420
-
Jandy / LRZ / Lite / Teledyne Laars / Zodiac: Part # R0015500, R0011300
- All Models
-
Davey / Spa-Quip:
-
- EcoSpa, Eco-Salt, and other spa equipment
- Davey Solarmatic - Part of M6601
- EcoSpa, Eco-Salt, and other spa equipment
-
-
Jacuzzi
- J-HN250C & J-HN400C heaters, most Hayward heaters and Compu-Heat spa controllers.
Specifications:
- Voltage: 12V to 24V
- Part Number: 800120 - Supersedes 800140 / 800130 / 800122 / 800***
- Contact Rating: 21A - Normally-Open or Normally-Closed
- Adjustment: 1-5 psi / 6.9-34.5 kPa / 0.7-3.5 meters head
- Thread: 1/8" NPT (approx 6mm) - Originally Stainless Steel. Now Noryl for corrosion-resistance
Len Gordon LG Part Nos:
- ALLIED Innovations 800*** 800120-3 | 800140 | 800130 | 800132-3 | 800134-3 | 800122 | 800123 | 800140-0 | 800140-3 | 800140-4 | 11/13 6AMP more.
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" | 25 mm | ~33.4–33.7 mm |
| 1.5" | 40 mm | ~48.1–48.4 mm |
| 2" | 50 mm | ~60.2–60.5 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.
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).
PVC Pressure Pipe AS/NZ 1477 Dimensions1:
Common nominal sizes with typical outside diameters and indicative inside diameters by class.
| Imperial Name | Metric Name | Outside Diameter (OD) | Class 9 IDº | Class 12 IDº | Class 18 IDº |
|---|---|---|---|---|---|
| 1/2" | 15 mm | ~21.2–21.5 mm | 18.3 mm | 17.8 mm | |
| 3/4" | 20 mm | ~26.6–26.9 mm | 23.7 mm | 22.4 mm | |
| 1" | 25 mm | ~33.4–33.7 mm | 30.5 mm | 29.8 mm | 28.1 mm |
| 32 mm | ~42.1–42.4 mm | 38.5 mm | 37.5 mm | 35.4 mm | |
| 1.5" | 40 mm | ~48.1–48.4 mm | 45.2 mm | 44.1 mm | 42.8 mm |
| 2" | 50 mm | ~60.2–60.5 mm | 55.2 mm | 53.7 mm | 50.5 mm |
| 65 mm | ~75.2–75.5 mm | 68.9 mm | 67.0 mm | 63.2 mm | |
| 2.5" | ~73 mm |
- 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.
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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