Spa Ozone Check (One-Way) Valve - for 5-6mm ID Tubing
Spa Ozone Check (One-Way) Valve - for 5-6mm ID Tubing is temporarily out of stock and will ship as soon as it's available.
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Spa Ozone Check (One-Way) Valve - for 5-6mm ID Tubing
Spa Ozone Check (One-Way) Valve - for 5-6mm ID Tubing is temporarily out of stock and will ship as soon as it's available.
Spa Ozone Check Valve – One-Way Valve for 5–6mm ID Ozone Tubing
Ozone-resistant one-way check valve designed to suit common 5–6mm internal-diameter spa ozone tubing, also 1/4", 5/16", 3/8" tubing. Commonly used in spa and hot tub ozone systems fitted with Balboa, CSN, DEL Ozone, Joyonway and similar ozone equipment.
This low-pressure 1/2 PSI ozone check valve allows ozone gas to flow toward the spa water while helping prevent water from travelling backwards into the ozone generator. A functioning check valve is an important part of protecting the ozonator from water damage.
- Physically stocked, unlike most drop-shipping websites
- Shipped from locations in VIC, NSW, WA and QLD
Important Tubing Information
These check valves are intentionally a very tight fit. The outside diameter of the barb will be larger than the tubing’s internal diameter so the tubing stretches over the barb and forms a secure, ozone-resistant seal.
Gently warming the end of the tubing will soften it and make installation easier. Do not overheat or burn the tubing.
Older ozone hose commonly becomes hard, brittle or slightly shrunken with age. Ozone can degrade the tubing material, and can cause plasticisers to migrate or break down, reducing the flexibility of the hose.
Old tubing should be replaced if it remains stiff, cracked or difficult to stretch after gentle warming with heat gun or torch. Reusing hardened ozone tubing can result in air leaks, poor ozone delivery or the tubing splitting around the fitting.
Specifications
- Product type: Spa ozone check valve / one-way valve
- Tubing compatibility: Common 5–6mm ID ozone tubing
- Valve pressure: 1/2 PSI
- Construction: Ozone-resistant materials
- Application: Spa, hot tub and selected pool ozone systems
Maintenance and Replacement
Ozone, also known as O3, is a highly reactive gas that gradually attacks tubing, seals and other components within an ozone system. Ozone check valves should therefore be inspected and replaced as part of routine spa maintenance.
Replace the valve immediately if it is leaking, blocked, cracked, discoloured, allowing water to travel toward the ozonator, or no longer allowing ozone gas to pass correctly.
Installation Information
- Replacement 5mm ID spa ozone tubing is available here.
- This valve can be used as a replacement for this stepped-barb DEL Ozone check valve where the tubing size and installation arrangement are compatible.
- Use gentle heat to soften the end of the tubing before pushing it over the barb.
- Push the tubing fully over the barb to create a secure seal.
- Always use new ozone-resistant tubing when replacing components in an ozone system.
- Confirm the direction-of-flow marking before installation.
Please check the internal diameter and condition of your existing ozone tubing before ordering. Tubing that has become hard or shrunken should be replaced rather than forced onto a new valve.
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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