Zodiac Filter Canister Inlet Flap CN - FreeRider FR1000/FR2000 iQ, Duo-X DX3000/DX4000/DX4050 iQ, CX40/CX50, Astralpool QB600/QB800 - R0898400
Zodiac Filter Canister Inlet Flap CN - FreeRider FR1000/FR2000 iQ, Duo-X DX3000/DX4000/DX4050 iQ, CX40/CX50, Astralpool QB600/QB800 - R0898400 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.
Delivery and Shipping Info*
Delivery and Shipping Info*
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Zodiac Filter Canister Inlet Flap CN - FreeRider FR1000/FR2000 iQ, ...
Zodiac Filter Canister Inlet Flap CN - FreeRider FR1000/FR2000 iQ, Duo-X DX3000/DX4000/DX4050 iQ, CX40/CX50, Astralpool QB600/QB800 - R0898400 is temporarily out of stock and will ship as soon as it's available.
Zodiac Filter Canister Inlet Flap CN - FreeRider FR1000/FR2000 iQ, Duo-X DX3000/DX4000/DX4050 iQ, CX40/CX50, Astralpool QB600/QB800 - R0898400
Genuine Zodiac / Astralpool R0898400 - the canister inlet flap for the CN chassis robotic pool cleaner. The flap is a one-way door at the canister inlet: it opens under suction to admit debris and closes when the cleaner stops, so the load stays in the canister instead of falling back into the pool.
- We keep these physically in stock for fast shipping or local pick-up, unlike most drop-shipping websites.
- Shipped from VIC, NSW, WA, QLD
Suits the following robotic pool cleaners
- Zodiac FreeRider FR1000 iQ, FR2000 iQ
- Zodiac Duo-X DX3000, DX4000, DX4050 iQ
- Zodiac CX40, CX50
- Astralpool QB600, QB800
Part details
- Manufacturer part number: R0898400
- Component: Canister inlet flap
- Works with: Inlet flap spring R0905500
- Chassis platform: CN
- Genuine: Yes, genuine Zodiac / Astralpool spare part
When to replace it
- Debris falls back out of the cleaner when it is lifted from the pool
- Flap is cracked, distorted or missing
- Flap sticks open or jams shut
- Flap no longer sits flush against the inlet
If the flap itself is sound, check the spring - a weak or broken spring produces the same symptom.
Fitment disclaimer
The models listed above are the applications we have been able to confirm. Zodiac, Astralpool and Polaris share components across several cleaner families and revise part numbers over time, so this list may not be exhaustive and your machine may use a different part. Always match the part number on your existing component, or contact us with photos plus your model and serial details, before ordering.
As with all products, these must be diagnosed and fitted by a qualified and experienced person.
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
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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R0898400
