Edgetec / Decina Triflo Pump Plumbing Unions - Inlet & Outlet
Edgetec / Decina Triflo Pump Plumbing Unions - Inlet & Outlet is backordered and will ship as soon as it is back in stock.
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Edgetec / Decina Triflo Pump Plumbing Unions - Inlet & Outlet is backordered and will ship as soon as it is back in stock.
Edgetec / Decina / Spa-Craft Triflo Pump Barrel Union Pair
Replacement pump plumbing barrel union pair for Edgetec-made spa bath pumps. Supplied as a complete set with 1 x union tail, 1 x union nut, and 1 x O-ring for both the inlet and outlet connections.
These are the common unions used on Edgetec / Decina / Spa-Craft Triflo spa bath pumps and suit 40mm pressure pipe (approximately 48mm outside diameter).
Original unions were typically white when new, but many older ones have aged to a cream or yellow colour over time as the earlier plastics were not as UV resistant.
These unions suit all Edgetec-made spa bath pumps, including those sold under the Edgetec, Decina and Spa-Craft brands.
They are also known to fit WWDG and SpaPro pumps that use the same Edgetec-style plumbing connections.
Includes
• 1 × barrel union tail
• 1 × union nut
• 1 × O-ring
Pipe Size
• Suits 40mm pressure pipe
• Pipe outside diameter approximately 48mm
Fits Edgetec / Decina / Spa-Craft Triflo pump ranges including
Auto-Heat series
E-6100 – TF075-AH-50 / TF075-AH-50-HF
E-6200 – DC075-AH / DC075-AH-50-HF
E-6106 – TF060-AH-50 / TF060-AH-50-HF
E-6206 – DC060-AH / DC060-AH-50-HF
E-6103 – TF110-AH-50 / TF110-AH-50-HF
E-6203 – DC110-AH-50 / DC110-AH-50-HF
Xtra-Heat series
E-6101 – TF075-XH-50 / TF075-XH-50-HF
E-6201 – DC075-XH / DC075-XH-50-HF
E-6107 – TF060-XH-50 / TF060-XH-50-HF
E-6207 – DC060-XH / DC060-XH-50-HF
E-6104 – TF110-XH-50
E-6204 – DC110-XH / DC110-XH-50
Spa-Key / Eco Key series
E-6102 – TF075-SK-50 / TF075-SK-50-HF
E-6202 – DC075-SK / DC075-SK-50-HF
E-6108 – TF060-SK-50 / TF060-SK-50-HF
E-6208 – DC060-SK-50 / DC060-SK-50-HF
Sends-Touch / EcoTouch series
E-6109 – TF075-ST-50 / TF075-ST-50-HF
E-6209 – DC075-ST / DC075-ST-50-HF
E-6111 – TF060-ST-50 / TF060-ST-50-HF
E-6211 – DC060-ST-50 / DC060-ST-50-HF
Eezi-Touch series
E-6127 – TF060-ET-50 / TF060-ET-50-HF
E-6227 – DC060-ET / DC060-ET-50
E-6121 – TF075-ET-50 / TF075-ET-50-HF
E-6221 – DC075-ET / DC075-ET-50-HF
E-6124 – TF110-ET-50 / TF110-ET-50-HF
E-6224 – DC110-ET / DC110-ET-50
These unions are commonly replaced when removing or installing spa bath pumps, or when the original fittings have become brittle, discoloured, or damaged with age.
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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Edgetec Union (Single) E-9-2007 + e-9-2008 + e-9-2009



