5/8" Type 6 Mechanical Seal - Aquaflo Waterway Pumps - 32mm OD 15.3 ID
5/8" Type 6 Mechanical Seal - Aquaflo Waterway Pumps - 32mm OD 15.3 ID is temporarily out of stock and will ship as soon as it's available.
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5/8" Type 6 Mechanical Seal - Aquaflo Waterway Pumps - 32mm OD...
5/8" Type 6 Mechanical Seal - Aquaflo Waterway Pumps - 32mm OD 15.3 ID is temporarily out of stock and will ship as soon as it's available.
5/8" Type 6 Carbon-Ceramic Mechanical Seal
Replacement mechanical shaft seal for many Aqua-Flo and Waterway spa pumps. Commonly used on Aqua-Flo XP, XP2, XP2E, CMCP, CMHP, Circ-Master and FMHP pumps using seal part number 92500150 & 92500171.
Also suits many Waterway pumps, including selected Viper pumps and some Piranha circulation pumps. Please compare the original seal style and dimensions before ordering, as some similar-looking pumps use a different seal.
Do not confuse this with the similar-looking 5/8" Type 7 seal listed here.
This is an upgraded carbon-ceramic mechanical seal, not a cheap low-grade replacement.
Specifications:
- Seal type: 5/8" Type 6 mechanical shaft seal
- Ceramic side including rubber: 32mm OD
- Carbon spring internal diameter: 15.3-15.8mm ID
- Carbon face / ceramic base / nitrile elastomers
- Common cross-reference numbers: Gecko 92500171 Universeal, 92500150, PS-200, PS200, AS-200, AS 200, SE-200, VG-200, PS-3867, PS-1901, PS-3960, S5/8T6, 35-423-1020
- Common search terms: Aqua-Flo XP shaft seal, Aqua-Flo XP2 shaft seal, Aqua-Flo XP2e shaft seal, Aqua-Flo Flo-Master XP2 seal, Circ-Master mechanical seal, Circmaster mechanical seal, 5/8" Type 6 mechanical seal
In plumbing, named sizes are not the actual measurements. A pipe called “50mm” or “2"” does not measure 50 mm across. Instead, it follows nominal sizing, an internationally-standardised naming system.
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 |
These are nominal sizes and are designed to fit matching fittings — not to measure exactly 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 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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S5/8T6 or h65cc