Astralpool / Hurlcon V Clamp Bolt - Multiport Valve, RX180, RX280, RX320, RX360, RX400, RX500 - 4020001

Name: Astralpool / Hurlcon V Clamp Bolt - Multiport Valve, RX180, RX280, RX320, RX360, RX400, RX500 - 4020001
Brand: Astralpool
SKU: 4020001
Price: 3.00 AUD
Availability: InStock

FREE SHIPPING OVER $149 (T&Cs)

$3.00

Tax included Shipping calculated at checkout.

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.

Delivery and Shipping Info

Free Shipping over $149 for most products. Choose Express Post where available for fastest shipping!

Free, Flat Rate & Express Post Shipping Information.

Warranty Information

Warranty Information Here

Astralpool / Hurlcon V Clamp Bolt - Multiport Valve, RX Sand Filters - 4020001

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 Astralpool 4020001 bolt, item 14 on the RX multiport valve diagram. It draws the two halves of the V clamp set together so the multiport valve is pulled down onto the tank body O-ring. Sold individually.

Which Filters This Suits

Astralpool / Hurlcon RX sand filters: RX180, RX280, RX320, RX360, RX400 and RX500.
Used with V clamp set 75010, which is supplied with the complete 40mm valve 76032 and the complete 50mm valve 76033.

If you are not certain, send us photos of your existing clamp and bolt along with the filter model label and we will confirm which one you need.

When to Replace It

The bolt has corroded and can no longer be tightened or undone.
The head has rounded off, or the bolt had to be cut out to free the clamp.
The thread is stripped and the clamp will not pull up tight.

Check the tank body O-ring, 75058, while the clamp is off. Always shut the pump down and release filter pressure before loosening the clamp bolt.

Specifications

Part number: 4020001
Diagram reference: item 14, RX multiport valve
Position: joins the two halves of the multiport valve V clamp
Sold as: single bolt
Filter family: Astralpool / Hurlcon RX sand filters
Brand: Astralpool / Hurlcon (Fluidra)
Barcode: 9343609002602

Related RX Multiport Valve Parts

Frequently Asked Questions

What is the 4020001 bolt for?
It is the bolt that closes the V clamp set holding the multiport valve to the filter tank. It is item 14 on the RX parts diagram.

Does it come with the V clamp set?
Order this bolt separately if yours is corroded, rounded off or has been cut out.

How many do I need?
One bolt per V clamp set. Order the quantity that matches the number of clamps you are refitting.

Can I use a hardware store bolt instead?
We supply the genuine Astralpool bolt because the clamp relies on the correct length and thread to pull up square. A substitute that is too long or too short can distort the clamp or leave the joint leaking.

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.

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 Dimensions^1.

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.

Quick example: A 2" / 50 mm fitting is named for the pipe it connects to, but the pipe’s actual outside diameter (OD) is approx. 60.3 mm (typically ~60.2–60.5 mm in AS/NZ pressure pipe).

Another example: a 2” / 50mm o-ring may refer to a barrel union, etc that suits 50mm pipe. Eg: a “50mm Balboa Gasket” refers to a heater gasket that measure 74mm across, but suits a Balboa barrel union made for 50mm pipe (and the 50mm pipe does not measure 50mm either!)

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).

Important: For pool/spa work, most plumbing uses Pressure Pipe (AS/NZ standards) — not DWV. Always check OD and the pipe class against your equipment specifications.

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

Payment & Security

We accept: Visa, Mastercard, Amex, Apple Pay, Google Pay, ShopPay, Paypal, Zip, Afterpay

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

4020001