Astralpool Pump Seal Plate O-Ring - CTX, E-Series, E-Combie, Viron XT P320 / P520 Pre Nov 2020 - 70022 / SP70022

Name: Astralpool Pump Seal Plate O-Ring - CTX, E-Series, E-Combie, Viron XT P320 / P520 Pre Nov 2020 - 70022 / SP70022
Brand: Astralpool
SKU: 70022
Price: 45.00 AUD
Availability: InStock

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Astralpool Pump Seal Plate O-Ring - CTX, E-Series, E-Combie, Viron XT P320 / P520 Pre Nov 2020 - 70022 / SP70022 is temporarily out of stock and will ship as soon as it's available.

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Astralpool Pump Seal Plate O-Ring - 70022 / SP70022

Genuine Astralpool seal plate o-ring, part number 70022, also catalogued by Fluidra as SP70022. Round profile with a dimple at the top. This is the seal plate to pump body o-ring fitted to CTX and E-Series pumps from August 2014, and to the Viron XT variable speed pumps built before November 2020. One per pump.

Physically Stocked, unlike most "drop-shipping" websites.
Shipped from VIC, NSW, WA, QLD

Matching Seal Plate

This is the o-ring for the Series 2 seal plate, 40098 / SP40098, introduced August 2014 and used until the November 2020 revision. If your pump is the later generation, you need 70030 / SP70030 instead.

Suits

CTX Pumps - models 11200, 11201, 11202, 11203, 11204
E-Series Pumps - new style seal plate seal, August 2014 onwards - models 11475, 11476, 11477, 11478
E-Combie Pumps
Viron P320
Viron XT P320 and P520 Variable Speed - before November 2020
WWDG X-1, X2

Check the Profile Before You Order

The three Astralpool seal plate o-rings are told apart by their cross-section:

70004 / SP70004 - square profile. BX, FX, Viron P280 / P300 / P600, E-Series old style.
70022 / SP70022, this listing. Round profile with a dimple at the top. Seals the Series 2 seal plate, 40098 / SP40098.
70030 / SP70030 - plain round o-ring. Seals the Series 3 / MkII seal plate, 40030 / SP40030.

Fit the Mechanical Seal at the Same Time

Whenever the seal plate comes out the mechanical seal is disturbed. Fit a new mechanical seal (PS3868) along with the o-ring. Reusing either is the most common cause of a leak straight after the job.

Manufacturer Catalogues, Diagrams & Part Numbers

Need exploded views, spare part numbers, product numbers, diagrams, or more product information? See the manufacturer catalogues: Astralpool Catalogue 2026 | Zodiac Catalogue 2026

Common search terms: Astralpool 70022, SP70022, CTX seal plate o ring, E-Series seal plate o-ring, Viron XT P320 o-ring, Series 2 seal plate gasket, Hurlcon CTX pump body o-ring.

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

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