Astralpool Multiport Valve 50mm - CA Series Sand Filter - 76053
Astralpool Multiport Valve 50mm - CA Series Sand Filter - 76053 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 50mm - CA Series Sand Filter - 76053
Astralpool Multiport Valve 50mm - CA Series Sand Filter - 76053 is temporarily out of stock and will ship as soon as it's available.
Astralpool Multiport Valve 50mm - CA Series Sand Filter - 76053
- We keep these physically in stock for fast shipping or local pick-up, unlike most drop-shipping websites.
- Shipped from VIC, NSW, WA, QLD
Top-mount 6-position multiport valve for Astralpool CA series sand filters with 50mm ports.
Confirm Your Filter Family First
Astralpool multiport valves look very similar across the ranges but are not interchangeable. Confirm which filter you have before ordering:
- CA series, 50mm - this valve, 76053.
- CA series, 40mm - 76044.
- ECA series (48.1mm centre pipe) - 76036.
- EC series (50mm centre pipe) - 76037.
- Cantabric - 76038.
If you are not certain, send us photos of your existing valve and the filter model label and we will confirm which one you need.
Before Replacing the Whole Valve
A complete valve is rarely the cheapest fix. Water running to waste while the handle is set to Filter is normally a worn spider gasket - see 75916 for the 40mm valve. Handles, sight glasses and diverters are also stocked individually.
Specifications
- Part number: 76053
- Port size: 50mm
- Mounting: top mount
- Positions: 6 (Filter, Backwash, Rinse, Waste, Recirculate, Closed)
- Filter family: CA series
- Barcode: 9343609010294
Related CA & Cantabric Filter Parts
- Multiport Valve 40mm, CA Series - 76044
- Multiport Valve 40mm, Cantabric - 76038
- Thread Collar / MPV Lock Nut, CA - 77720
- O-Ring, Tank Lid, CA / Cantabric - 7211820060
- Lateral Hub, ECA & CA Media Filter - 77712
- Laterals 235mm, Pair, CA340 / CA400 - 77757
- Component Bag 40mm CA Filter - 78334
Frequently Asked Questions
Will this valve fit an ECA or EC filter?
No. ECA filters use valve 76036 and EC filters use 76037. This valve suits the CA series. The centre pipe outside diameter is the reliable way to tell EC from ECA - 50mm is EC, 48.1mm is ECA.
Water runs to waste while the valve is set to Filter. Do I need a new valve?
Usually not. That symptom is normally a worn spider gasket, which costs a fraction of a complete valve.
How many positions does the valve have?
Six: Filter, Backwash, Rinse, Waste, Recirculate and Closed.
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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