Hydroair 50mm Spa Jet Diverter Valve Control Repair Parts - 100mm Diameter
Hydroair 50mm Spa Jet Diverter Valve Control Repair Parts - 100mm Diameter - is temporarily out of stock and will ship as soon as it's available.
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Don't Guess - Ask Us!
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Hydroair 50mm Spa Jet Diverter Valve Control Repair Parts - 100mm D...
Hydroair 50mm Spa Jet Diverter Valve Control Repair Parts - 100mm Diameter - is temporarily out of stock and will ship as soon as it's available.
Hydroair 50mm Spa Jet Diverter Valve Control Repair Parts - 100mm Diameter
Hydroair / HydroQuip 50mm Spa Jet Diverter (Jet Selector) Valve Control Repair Parts - 100mm DiameterCap Diameter of 100mm. Originally came in grey, white and in notched or scalloped tops. Common diverter parts for many older spas.
- Physically Stocked, unlike most "drop-shipping" websites.
- Shipped from VIC, NSW, WA, QLD
This is the Non-Buttress style that suited Monarch and many other brands in the late 1990s and early 2000s. V
ery common on Australian-made spas from the early 2000s, from Signature, Spa Industries, and Monarch Spas.
On Spa Industries made spas, they often had a "Jet Selector" label on them.
White parts are discontinued. Replace with grey parts.
These have a V-shaped thread on the body. If you have a similar-looking Buttress-threaded diverter, you will need parts for a different (Waterway) diverter.
Parts Available:
- Complete Valve Kit - Includes rotor, cap, handle, seals, body. Use parts from complete valve to repair older valves. Only comes in grey.
- O-ring Seal Kit - replaces cap seal & stem seals. Note that if cap seal does not fit old body, the body has warped and entire body will need to be replaced.
Important Notes: There are similar parts to these. In order for these to fit, your Cap must *not* have the word "Buttress" printed underneath. See below photo to double-check the thread on your diverter body.
Non-Buttress "V-Shape" thread is used on older spas, including many older Signature, Spa Industries, and Monarch Spas. "Buttress" is a later type of thread used. 
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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