Astralpool Clamp Band Complete - ECA550, ECA650 Sand Filter - 77730
Astralpool Clamp Band Complete - ECA550, ECA650 Sand Filter - 77730 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 Clamp Band Complete - ECA550, ECA650 Sand Filter - 77730
Astralpool Clamp Band Complete - ECA550, ECA650 Sand Filter - 77730 is temporarily out of stock and will ship as soon as it's available.
Astralpool Clamp Band Complete - ECA550, ECA650 Sand Filter - 77730
- We keep these physically in stock for fast shipping or local pick-up, unlike most drop-shipping websites.
- Shipped from VIC, NSW, WA, QLD
Complete replacement tank clamp band for Astralpool ECA series sand filters. This is the band that draws the multiport valve down onto the tank and holds the lid joint closed.
Band, or Just the Fasteners?
Work out which part has actually failed before ordering:
- Band cracked, distorted, corroded through or has let go - this part, 77730.
- Band sound but the bolt is seized, stripped or missing - the fastener kit, 78399, is far cheaper.
- Band sound and correctly tightened but the joint still weeps - that is normally the tank lid O-ring, 7201750057.
Fitment
- Astralpool ECA550 media filter
- Astralpool ECA650 media filter
CA and Cantabric filters do not use a clamp band. They use a threaded collar / MPV lock nut - see 77720.
Safety
- Shut the pump down and fully release system pressure at the manual air bleed before loosening or removing the clamp band.
- Never run the filter with a cracked or incomplete clamp band. The lid joint is a pressure joint.
- Tighten evenly and do not over-tighten - over-tightening distorts the band and will not cure a leaking seal.
Specifications
- Part number: 77730
- Fits: Astralpool ECA550, ECA650
- Function: tank to multiport valve clamp band
- Supplied: complete band
- Barcode: 9343609014803
Related ECA Filter Parts
- Multiport Valve 40mm, ECA550 / ECA650 - 76036
- Clamp Band Bolt, Nut & Allen Key Kit - 78399
- O-Ring, Tank Lid Green, ECA - 7201750057
- Lateral Hub, ECA & CA Media Filter - 77712
- Laterals 175mm, Pair - 77756
- Drain Plug Cap, CA / ECA - 77717
- Component Bag 40mm ECA Multiport - 78355
Frequently Asked Questions
Does 77730 include the bolt and allen key?
Contact us to confirm what is packed with the band for your order. If you only need the fastener, the bolt, nut and allen key kit is part 78399.
Will this fit a CA or Cantabric filter?
No. CA and Cantabric filters secure the multiport valve with a threaded collar or lock nut, part 77720, not a clamp band.
My ECA filter lid is weeping. Do I need a new clamp band?
Only if the band is cracked, distorted or will no longer tighten. If the band is sound, the tank lid O-ring 7201750057 is the more likely fix.
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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