Waterco Vac Plate (Vacuum Plate)
Waterco Vac Plate (Vacuum Plate) is temporarily out of stock and will ship as soon as it's available.
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Waterco Vac Plate (Vacuum Plate)
Waterco Vac Plate (Vacuum Plate) is temporarily out of stock and will ship as soon as it's available.
Waterco Vac Plate (Vacuum Plate)
- Physically Stocked, unlike most "drop-shipping" websites.
- Shipped from VIC, NSW, WA, QLD
Vac plate (vacuum plate) to suit the Waterco S75 skimmer box, both the earlier press-fit S75 and the S75 MK2 lock-down, and the Fulflo and Nally skimmers that share the same plate. The three lugs locate on the lugs inside the skimmer body and a quarter turn locks the plate down over the basket. Approx. 270 to 275mm across (suppliers quote this pattern between those figures) with a threaded centre port for the vacuum hose; Waterco specifies a standard 40mm (1 1/2 inch) male threaded plug to blank the port when not vacuuming. Equivalent to the Waterco 62408 three-lug vacuum plate.
Check before ordering: count the lugs on the old plate. Four lugs means the Waterco Supaskimmer lock-down plate (Waterco 624084), which is a different part. The O-ring for the S75 plate is Waterco 62468.
Product details
- Product: Waterco Vac Plate (Vacuum Plate)
- Part number: PA-523
- Type: skimmer box vac plate (vacuum plate)
- Diameter: approx. 270 to 275mm
- Lugs: 3 lock-down lugs, quarter-turn fit
- Centre port: threaded; takes a standard 40mm (1 1/2 inch) male threaded plug
- Fits: Waterco S75 (press-fit and MK2 lock-down), Fulflo and Nally skimmer boxes
- Not for: Waterco Supaskimmer (4-lug plate, Waterco 624084)
- O-ring part number: Waterco 62468
- Cross reference: Waterco 62408, HABCO H523
See the full range of pool vac plates (vacuum plates).
Confirm product is correct before ordering. Contact us if unsure.
Common search terms: Waterco vac plate, Waterco vacuum plate, Waterco S75 vac plate, S75 MK2 vacuum plate, Nally vac plate, Fulflo vacuum plate, Waterco 62408, 3 lug vacuum plate, 270mm vac plate, 275mm vac plate, pa-523, WWDG SpaPro.
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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PA-523
