Astralpool Multiport Valve Handle 40mm & 50mm - 75903
Astralpool Multiport Valve Handle 40mm & 50mm - 75903 is temporarily out of stock and will ship as soon as it's available.
Don't Guess - Ask Us!
Don't Guess - Ask Us!
Not sure if it’s the right part? Send us a message and a photo of what you’re replacing, or what you need, and we’ll help make sure you get the right part the first time.
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Delivery and Shipping Info*
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Astralpool Multiport Valve Handle 40mm & 50mm - 75903
Astralpool Multiport Valve Handle 40mm & 50mm - 75903 is temporarily out of stock and will ship as soon as it's available.
Astralpool Multiport Valve Handle 40mm & 50mm - 75903
- We keep these physically in stock for fast shipping or local pick-up, unlike most drop-shipping websites.
- Shipped from VIC, NSW, WA, QLD
Genuine replacement handle for the Astralpool multiport valve. Suits both the 40mm and 50mm valves. Handles crack or snap at the hub, most often from being turned without first shutting the pump down and releasing pressure.
If the handle turns but the valve will not hold position, the spring is the more likely fault.
Which Multiport Valve Part Has Actually Failed?
A complete valve is rarely the cheapest fix. Match the symptom to the part before you order:
| Symptom | Usual part |
|---|---|
| Water running to waste while set to Filter | Spider gasket 75916 |
| Handle cracked, snapped or spinning freely | Handle 75903 |
| Handle will not hold or return to position | Spring 75912 |
| Sight glass cracked, clouded or weeping | Sight glass 75906 |
| Pressure gauge dead, fogged or reading wrong | Pressure gauge 75043 |
| Diverter worn where it rides on the gasket | Diverter 75902 |
| Top cover cracked or distorted | Top cover 75901 |
| Valve body cracked or leaking from the body | Body 75900 |
Check the Age of Your Valve
Astralpool changed the 40mm multiport valve in September 2009. Parts are not interchangeable across that change. The quickest check is the spider gasket: the post-2009 valve uses a 128mm outer diameter, 4-spoke gasket. If yours does not match that, you have a pre-September 2009 valve - send us a photo and we will confirm what fits before you order.
Fitment
Suits Astralpool and Hurlcon 40mm multiport valves manufactured from September 2009 onwards, as fitted to filters including:
- EC550, EC650
- ECA550, ECA650
- CA280
- FG604
- RX180, RX280
- HXF001
Other models also use this valve. If your filter is not listed, send us a photo of the valve and we will confirm.
Specifications
- Part number: 75903
- Component: multiport valve handle
- Port size: suits 40mm and 50mm valves
- Valve generation: post-September 2009
- Barcode: 9343609028558
Related Multiport Valve Parts
- Spider Gasket 40mm MPV, 128mm 4-spoke - 75916
- Diverter, 40mm MPV - 75902
- Sight Glass, MPV - 75906
- Spring, MPV - 75912
- Top Cover, 40mm MPV - 75901
- Body, 40mm MPV - 75900
- Diffuser, 40mm MPV - 75910
- Pressure Gauge with Covers - 75043
- Complete Multiport Valve 40mm, EC550 / EC650 - 76037
Frequently Asked Questions
Does this handle fit both the 40mm and 50mm valves?
Yes. Part 75903 is listed for the Astralpool multiport valve in both 40mm and 50mm sizes.
My handle turns but the valve will not stay in position. Is the handle faulty?
Probably not. That symptom usually points to the valve spring, part 75912, rather than the handle itself.
Why did the handle break?
Most commonly from operating the valve under pressure. Always shut the pump down and release system pressure before moving the handle.
Manufacturer Catalogues, Diagrams & Part Numbers: Need exploded views, spare part numbers, product numbers, diagrams, or more product information? See the manufacturer catalogues below.
Important Before Ordering: Please ensure you order correctly. Confirm this product is suitable before ordering. Use the catalogues above, seek professional assistance, or contact us with photos of your existing part, model details, serial numbers, and any labels.
As with all products, these must be diagnosed and fitted by a qualified and experienced person.
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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