PPR Nipple with loose nut
The brass nut turns freely on the fitting, so the PP-R body stays welded in place while the nut is tightened onto a fixed male thread. The joint is sealed by the gasket inside the nut, not by the thread. This makes it suitable for boiler and appliance connections where the fitting itself cannot be rotated.
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Description and application
The THERMALINO PPR nipple socket with loose nut is a PP-R fitting with a socket fusion end and a CW617N brass nut with a BSP parallel (G) female thread. It connects PP-R pipework to the male threaded outlets of combi boilers, gas boilers and other appliances without rotating the fitting, and the gasket in the nut seals the joint.
The THERMALINO PPR nipple socket with loose nut is a transition fitting from the Eternal line. It joins PP-R pipe to a fixed male thread. One end is a PP-R socket for fusion welding. The other end is a brass nut with a BSP parallel (G) female thread, also called a gas thread. The nut turns freely on the fitting, and a gasket inside it seals against the male end it is tightened onto. The body is PP-R, a random copolymer of polypropylene (type 3), and is made to suit socket fusion with THERMALINO PP-R pipes. The threaded insert and nut are CW617N brass. The fitting is made to EN ISO 15874-3 and rated PN20. Its operating temperature is 70 °C and its maximum temperature is 95 °C, so it can be used for hot and cold drinking water and for central heating. The sizes are Ø20x1/2", Ø20x3/4", Ø25x1/2", Ø25x3/4", Ø25x1", Ø32x3/4" and Ø32x1", in white. It is mostly used to connect the water side of combi boilers and gas boilers. It also suits water heaters and other appliances whose connections are close to the wall, and it can be used to move from metal pipework to PP-R. The loose nut is useful wherever a threaded fitting cannot be turned on its own axis. The PP-R body is welded in its final position, and then only the nut is turned to make the joint. Installation takes two steps. First, the socket end is fusion welded to the PP-R pipe with a socket welding tool. Then the nut is tightened onto the appliance's male thread so that the gasket seats evenly. Welding times and the full technical values are in the technical data sheet.
- Water connections of combi boilers and gas boilers
- Water heater, calorifier and appliance connections close to the wall
- Hot and cold drinking water installations
- Central heating systems, at operating temperature 70 °C, maximum 95 °C
- Transitions from metal pipework to PP-R
- Connections to pumps, meters and equipment that must be removable for service
- Residential buildings, hotels, hospitals and schools
- Cooling water and process water lines, subject to the pressure, temperature and chemical resistance data in the technical data sheet
Technical summary
- SKU
- THL-E-PPR-0039
- Origin
- Made in Türkiye
- HS code
- 3917.40
- Size range
- Ø20 – Ø32
- Material
- PP-R
- Nominal pressure
- PN20
- Operating temperature
- 70 °C
- Max. temperature
- 95 °C
- Connection
- Socket fusion × Female thread
- Thread type
- BSP parallel (G)
- Insert material
- Brass (CW617N)
- Standard
- EN ISO 15874-3
Questions
- What is a PPR nipple socket with loose nut, and why would a plumber use it instead of a fixed female threaded adapter?
- A PPR nipple socket with loose nut is a PP-R fusion fitting with a freely turning brass nut, used where a threaded fitting cannot be rotated into place. The PP-R body is welded in its final position and only the CW617N brass nut is turned onto the male thread. A fixed female adapter, by contrast, has to be screwed on by turning the whole fitting.
- Can I use a PPR nipple socket with loose nut to connect a wall-hung combi boiler to PP-R heating and hot water pipes?
- Yes. The PPR nipple socket with loose nut is mainly used for the water connections of combi boilers and gas boilers. It is rated PN20, with an operating temperature of 70 °C and a maximum of 95 °C, to EN ISO 15874-3. It is for the water side only, and the boiler connection should be made by a qualified installer.
- How do you install a PPR nipple socket with loose nut on PP-R pipe and connect it to a boiler outlet?
- A PPR nipple socket with loose nut is installed by fusion welding its socket end to the PP-R pipe and then tightening its nut onto the male thread. Use a socket fusion welding tool and the welding times for the pipe size given in the technical data sheet. Leave the fitting aligned with the outlet so the nut can be tightened without strain and the gasket seats evenly.
- What thread does the PPR nipple socket with loose nut have, and does the thread or the gasket make the seal?
- The PPR nipple socket with loose nut has a BSP parallel (G) female thread, and the seal is made by the gasket inside the nut, not by the thread. The parallel thread holds the nut on the male end, and the gasket presses against that end's face. It fits G-threaded appliance outlets in 1/2", 3/4" and 1".
- Which sizes of PPR nipple socket with loose nut are available for 20, 25 and 32 mm PP-R pipe?
- The PPR nipple socket with loose nut comes in seven sizes from Ø20 to Ø32 mm: Ø20x1/2", Ø20x3/4", Ø25x1/2", Ø25x3/4", Ø25x1", Ø32x3/4" and Ø32x1". The first figure is the outside diameter of the PP-R pipe. The second is the BSP parallel thread of the nut. All sizes are white.
Range
| Size | White | Variant codes |
|---|---|---|
| Ø20x1/2"✓ White | ✓ | |
| Ø20x3/4"✓ White | ✓ | |
| Ø25x1/2"✓ White | ✓ | |
| Ø25x1"✓ White | ✓ | |
| Ø25x3/4"✓ White | ✓ | |
| Ø32x3/4"✓ White | ✓ | |
| Ø32x1"✓ White | ✓ |
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This product is listed under PPR Fittings With Brass.
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