Universal Pool & Spa Filter Pressure Gauge - Glycerin Filled - Astralpool®
Universal Pool & Spa Filter Pressure Gauge - Glycerin Filled - Astralpool® is backordered and will ship as soon as it is back in stock.
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Universal Pool & Spa Filter Pressure Gauge - Glycerin Filled - Astralpool® is backordered and will ship as soon as it is back in stock.
Universal pool and spa pressure gauge to suit the vast majority of filters, multiport valves, and other equipment that use a common 1/4" BSP threaded pressure gauge port. This genuine AstralPool liquid-filled gauge is a high-quality replacement for worn, inaccurate, leaking, or vibration-damaged gauges on many sand and cartridge filter systems.
Commonly suits many brands and filter ranges that use a 1/4" BSP pressure gauge thread, including numerous models from AstralPool, Hurlcon, Fluidra, Zodiac, Waterco, Davey, Monarch, Onga, Poolrite, Praher, Sensaclear, Edgetec, Quiptron, Dega, Insnrg, Hayward, Jandy, Pentair, Emaux, Neptune, Magnum, and more. Also used on many aftermarket and generic pool or spa filter systems with the same thread and mounting style.
- Genuine AstralPool pressure gauge
- Part Number: 75032
- Universal 1/4" threaded pressure gauge for many pool and spa applications
- Commonly used on sand filters, cartridge filters, multiport valves, and other filter equipment
- Liquid / glycerin / oil filled to help dampen needle vibration and pulsation
- Stainless steel casing
- Brass threads and internals
- Common pool industry thread size: 1/4" BSP (approx. 13mm thread diameter)
Used in many AstralPool / Hurlcon ranges including RX, QL, CL, CF, FC, E-Series, and UF, plus many other filters and valves across a wide range of brands that use the same 1/4" BSP gauge port.
Please note: pressure gauges are very commonly described as “universal” because they fit so many brands, but you should still confirm the thread type, thread diameter, and mounting style before ordering. This gauge suits equipment with the standard 1/4" BSP threaded gauge port.
The most common reasons pressure gauges fail are:
- Vibration and pulsation, which can damage the gauge over time. Liquid-filled gauges help reduce this.
- Chemical damage
- Dirt or debris bypassing the filter and blocking the gauge port
- High calcium or scale build-up
- Age, weathering, and general wear
Common Brands & Model Families This 1/4" BSP Pressure Gauge May Suit
This universal-style pressure gauge is commonly used on many pool and spa filters, multiport valves, and related equipment that use a 1/4" BSP threaded gauge port. Compatibility can vary, so always confirm thread type, mounting style, and dimensions before ordering.
-
AstralPool / Hurlcon / Fluidra
- RX Series
- QL Series
- CL Series
- CF Series
- FC Series
- E-Series
- UF Series
- Many AstralPool sand filters
- Many AstralPool cartridge filters
-
Hayward
- Pro Series
- SwimClear
- Star Clear
- Micro-Clear
- Perflex
- HCF Series
- ProGrid
- S160T
- S164T
- S166T
- S190T
- S200
- S210S
- S210T
- S220T
- S220T2
- S230T
- S240
- S244T
- S244T2
- S245T
- S270T
- S310S
- EC30
- EC40
- EC40AC
- EC65
- EC65A
- EC75
- EC75A
-
Poolrite
- V2000 Smart Valve
- S-Series
- Enduro
- S5000
- S6000
- S8000
- EN-650
- SE-550
- SE-650
-
Davey / Monarch
- EcoPure
- Reliance MK3
- Many Davey sand filters
- Many Davey cartridge filters
- Many Monarch filter systems
-
Waterco
- Many Waterco sand filters
- Many Waterco cartridge filters
- Many Waterco multiport valves
-
Zodiac
- Many Zodiac sand filters
- Many Zodiac cartridge filters
- Many Zodiac filter systems using 1/4" BSP gauges
-
Emaux
- V Series
- P Series
- MVP01
- MPV02
- P650
-
Pentair / Sta-Rite
- Meteor
- Meteor Top Mount
- Sand Dollar
- Tagelus
- Tagelus II
- Cristal-Flo II
-
Praher
- Many Praher multiport valve applications
-
Quiptron
- Many Quiptron filter systems
-
Dega
- Many Dega filter systems
-
Insnrg
- Many Insnrg filter systems
-
WWDG
- Many WWDG pool and spa filtration systems using a 1/4" BSP pressure gauge
- Many WWDG sand filter applications
- Many WWDG cartridge filter applications
-
SpaPro
- Many SpaPro pool and spa filtration systems using a 1/4" BSP pressure gauge
- Many SpaPro sand filter applications
- Many SpaPro cartridge filter applications
Important: This is a broad guide only. Pressure gauges are often described as universal, but you must still confirm the thread type, thread diameter, and mounting position before ordering.
75032
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 | ~60.2–60.8 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.
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) |
|---|---|---|
| 1/2" | 15 mm | ~21.2–21.5 mm |
| 3/4" | 20 mm | ~26.6–26.9 mm |
| 1" | 25 mm | ~33.4–33.7 mm |
| 32 mm | ~42.1–42.4 mm | |
| 1.5" | 40 mm | ~48.1–48.4 mm |
| 2" | 50 mm | ~60.2–60.8 mm |
| 65 mm | ~75.2–75.5 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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