Astralpool Clamp Band Complete, Multiport Valve to Tank - ECA550, ECA650 Sand Filter - 77730

Astralpool Clamp Band Complete, Multiport Valve to Tank - 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

77730 is the genuine Astralpool clamp band that holds the multiport valve onto the tank of ECA550 and ECA650 sand filters. It comes complete with the bolt, nut and Allen key. It fits around the neck of the filter and valve and, once tightened, keeps the valve to tank joint closed while the filter is under pressure. Astralpool's spare parts list calls it "MPV clamp band - ECA models". The filters are also sold and listed as Hurlcon ECA and Astral ECA.

Replace the band if it is cracked, bent or distorted, or will no longer tighten to good engagement. New fasteners come with it, so you do not need kit 78399 as well. If the band is sound and only the bolt is seized, stripped or missing, the bolt, nut and Allen key kit 78399 on its own is the cheaper fix.

What's Included

• Clamp band
• Clamp band bolt
• Clamp band nut
• Allen key to suit

The Clamp Band Rule (rev. ECA-1.1)

Astralpool ECA, EC, CA and Cantabric sand filters look alike. Check these before ordering:

1. Read the model label on the tank. Astralpool lists 77730 for ECA models: ECA550 and ECA650.
2. Look at how the multiport valve is held on. A clamp band around the neck of the tank and valve, tightened with a bolt, is the ECA arrangement this part suits.
3. A large threaded lock ring screwed onto the top of the tank means a CA or Cantabric filter. These do not use a clamp band. For CA models the lock nut is 77720.
4. A clamp band on a tank labelled EC550 or EC650 (no "A") means an EC filter. EC filters also use a clamp band, but Astralpool lists 77730 for ECA models, so send us a photo of the label and band before ordering.

This follows Astralpool's own installation instructions: ECA and EC valves are secured with a clamp band assembly around the neck of the filter and valve, while CA and Cantabric valves are held by a lock ring tightened by hand.

Worked Example

Say the clamp band on an ECA550 has cracked and the joint between the multiport valve and the tank now weeps when the pump runs. The label reads ECA550 and the valve is held by a clamp band, so this band, 77730, is the right part, and it comes with a new bolt, nut and Allen key. With the pump off and the pressure released, remove the old band and check the green valve to tank O-ring before refitting. If the O-ring is flattened, nicked or out of shape, order 7201750057 at the same time. Had the band been sound with only a seized bolt, kit 78399 would have been enough.

Which Part Do I Need?

What This Clamp Band Does Not Fit

• CA series (CA280, CA300, CA340, CA400) and Cantabric filters. These hold the valve with a threaded lock ring, not a clamp band. Astralpool lists the CA lock nut as a separate part, 77720.
• EC550 and EC650 (no "A" in the model). These also use a clamp band, but they are a different filter family that takes a different multiport valve, 76037, and Astralpool lists 77730 for ECA models. We have not confirmed this band for EC filters. Astralpool publishes different tank diameters for the two families (ECA550 586mm and ECA650 665mm, EC550 540mm and EC650 630mm), which helps if the label is missing, but send us a photo before ordering.

Signs the Clamp Band Needs Replacing

• The band is cracked, split, bent or distorted.
• The band will no longer tighten to good engagement around the neck of the filter and valve, even with a sound bolt.
• The valve to tank joint leaks and the band is damaged. If the band is sound and correctly tightened, the O-ring 7201750057 is the more likely cause.

Safety

• Turn the pump off and release the pressure in the filter before loosening or removing the clamp band. The valve to tank joint is a pressure joint.
• Never run the filter with the clamp band missing, cracked or loose. Astralpool rates ECA filters to a maximum operating pressure of 200 kPa.
• Tighten only enough for good engagement. Over-tightening will not cure a leaking seal and can distort the band.

Fitting Notes

With the pump off and the pressure released, Astralpool's installation instructions for ECA filters are:

1. Place the valve to tank O-ring in the cavity on the tank body.
2. Install the multiport valve into the top tank opening, making sure the O-ring stays in position, and rotate the valve to best suit the plumbing lines.
3. Once the valve is positioned, fit the clamp band assembly around the neck of the filter and valve and tighten it sufficiently for good engagement.
4. Astralpool notes it is not necessary to over-tighten.

Then restart the pump and check the joint for leaks.

Specifications

• Part number: 77730
• Astralpool description: MPV clamp band - ECA models
• Fits: Astralpool ECA550 and ECA650 sand (media) filters, also listed as Hurlcon ECA and Astral ECA
• Position: around the neck of the filter and multiport valve
• Function: holds the multiport valve onto the tank and keeps the valve to tank joint closed
• Supplied: clamp band, bolt, nut and Allen key
• Spare fasteners: bolt, nut and Allen key kit 78399, for a sound band with damaged or lost fasteners
• Seals with: valve to tank O-ring 7201750057
• Multiport valve: ECA 40mm, 76036
• ECA filter maximum operating pressure: 200 kPa (Astralpool)
• Barcode: 9343609014803

Related ECA Filter Parts

• Clamp Band Bolt, Nut & Allen Key Kit - 78399
• O-Ring, Valve to Tank (Tank Lid) Green, ECA - 7201750057
• Multiport Valve 40mm, ECA550 / ECA650 - 76036
• Component Bag 40mm ECA Multiport - 78355
• Lateral Hub, ECA & CA Media Filter - 77712
• Laterals 175mm, Pair - 77756
• Hub, Laterals & Stand Pipe Assembly, ECA550 - 77751
• Hub, Laterals & Stand Pipe Assembly, ECA650 - 77752
• Drain Plug Cap, CA / ECA - 77717

Frequently Asked Questions

What does the 77730 clamp band do?
It holds the multiport valve onto the tank of an Astralpool ECA550 or ECA650 sand filter. It fits around the neck of the filter and valve and, once tightened, keeps the valve to tank joint closed while the filter is under pressure.

Does 77730 include the bolt and Allen key?
Yes. 77730 comes complete with the clamp band bolt, nut and Allen key, so you do not need kit 78399 as well. Kit 78399 on its own is for a sound band whose fasteners are damaged or lost.

Will this fit a CA or Cantabric filter?
No. CA and Cantabric filters hold the multiport valve with a threaded lock ring, not a clamp band. For CA models the lock nut is part 77720.

Will this fit an EC550 or EC650 filter?
Not confirmed. EC filters also use a clamp band, but Astralpool lists 77730 for ECA models. Send us a photo of the tank label and your existing band and we will confirm before you order.

Does this fit a Hurlcon ECA filter?
Yes, if the tank label reads ECA550 or ECA650. These filters are also sold and listed as Hurlcon ECA and Astral ECA.

My ECA filter leaks where the valve meets the tank. Do I need a new clamp band?
Only if the band is cracked, distorted or will no longer tighten. If the band is sound but the bolt is seized or missing, kit 78399 is the fix. If the band and bolt are both sound and correctly tightened, the valve to tank O-ring 7201750057 is the more likely cause.

How tight should the clamp band be?
Astralpool's instructions are to tighten it sufficiently for good engagement, and they note it is not necessary to over-tighten. Over-tightening will not cure a leaking seal.

Can I run the filter without the clamp band?
No. The clamp band holds the multiport valve onto the tank, and that joint is under pressure whenever the pump runs. Astralpool rates ECA filters to a maximum operating pressure of 200 kPa. Keep the pump off until the new band is fitted and tightened.

Is this a genuine Astralpool part?
Yes. Heater and Spa Parts is an authorised Fluidra dealer and warranty agent, and this is the genuine Astralpool clamp band, part 77730.

Common search terms: 77730, Astralpool ECA clamp band, Astral ECA clamp band, Hurlcon ECA clamp band, Hurlcon sand filter clamp, ECA550 clamp band, ECA650 clamp band, MPV clamp band ECA, multiport valve clamp band, sand filter valve clamp, valve to tank clamp, ECA clamp band with bolt, WWDG SpaPro.

Manufacturer Catalogues, Diagrams & Part Numbers: Need exploded views, spare part numbers, product numbers, diagrams, or more product information? See the manufacturer catalogues below.

• Astralpool Catalogue 2026 | Zodiac Catalogue 2026

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.