Water Pressure Switch - Astralpool IXI, Zodiac, JXI, Pentair Mastertemp, Raypak - Tecmark
Water Pressure Switch - Astralpool IXI, Zodiac, JXI, Pentair Mastertemp, Raypak - Tecmark is temporarily out of stock and will ship as soon as it's available.
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Water Pressure Switch - Astralpool IXI, Zodiac, JXI, Pentair Master...
Water Pressure Switch - Astralpool IXI, Zodiac, JXI, Pentair Mastertemp, Raypak - Tecmark is temporarily out of stock and will ship as soon as it's available.
Water Pressure Switch - Astralpool IXI, Zodiac, JXI, Pentair Mastertemp, Raypak - Tecmark
Tecmark / HydroQuip Water Pressure switch used in Zodiac JXI 200 / 370, Astralpool IXI 200 / 370, Pentair Mastertemp 125 / 200 / 300 / 400, Waterco Turbotemp, Sta-Rite Max E Therm, Raypak heaters and many other applications. May be listed as several models, and are interchangeable. 1/8" NPT thread. Adjustable pressure.
- Physically Stocked, unlike most "drop-shipping" websites.
- Shipped from VIC, NSW, WA, QLD
May have the following details: Model - 4098AP-DB, 4098*-* / K30F, 38 , 04, 0407, 4037P CWCW / K30F 245, 4098P, 4010P, 4015P, 3010P, R0457002, 42001-0060S and others.
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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.
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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)
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INSNRG: Part # 8001403
- GI 160, GI 265, GI 420
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Jandy / LRZ / Lite / Teledyne Laars / Zodiac: Part # R0015500, R0011300
- All Models
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Davey / Spa-quip (SpaQuip):
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- EcoSpa, Eco-Salt, and other spa equipment
- Davey Solarmatic - Part of M6601
- EcoSpa, Eco-Salt, and other spa equipment
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Jacuzzi
- J-HN250C & J-HN400C heaters, most Hayward heaters and Compu-Heat spa controllers.
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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
- TC-4015P, asp-tdi4010p,AU-5-20-0026
Typical Applications
Commonly used as an interlock device to sense air, gas or water pressure at a specific point, Series 4000 switches provide on/off control of:
- Electric or gas heaters
- Pumps
- Small air compressors
- Electric Strip heaters in VAV systems
- Waste oil heating systems
- Food processing equipment
- Residential boilers
- Other electrical equipment in pneumatic, gas or fluid flow systems
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
To the layperson, plumbing sizes and their names can be confusing due to the nominal sizes and naming conventions used.
This is not something we made up. Plumbers and manufacturers have used nominal (meaning ‘by name only’) sizing for decades.
Simply put, in plumbing, named sizes are often not the actual measurements of the pipe, fitting, or part. A PVC pipe called “50mm” or “2"” does not measure 50 mm anywhere. Instead, it follows nominal sizing, an internationally-standardised naming system.
Almost all fittings we use in the pool & spa industry use “pressure PVC” pipe & fittings. Do not confuse with “DWV” or other pipe & fittings and their names and sizes.
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 |
To reiterate, these are nominal sizes and are designed to fit matching fittings — not to measure 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 and other plumbing areas 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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R0457002
