GF Malleable Fittings 310 - backnut, black

- Unique Whiteheart ductile Cast Iron to EN-GJMW-400-5
to BS EN 1562, design symbol A
- Thread type BSP - R or Rp to BS EN 10226-1 / ISO 7-1
- Union or flat-nut thread types to BS EN 228-1
- Manufactured to BS EN 10242 (ISO 49)
- Cast Iron is fire class A1 to BS EN 13501-1 (CWFT)
acc. to Commission Decision 96/603/EC (as amended)
- Natural Black or Galvanized (99.995 zinc)
- Coated with medical-grade oil for corrosion protection
- Suitable for systems covered by the Pressure Equipment
Safety Regulation:2016
- Max. pressure 25 bar up to 120 degrees,
between 120-300 degrees use interpolated values,
Max. 20bar at 300 degrees
- Sizes from ¼" to 4"

- Heating - LTHW, MTHW and HTHW
- Steam
- Chilled water and cooling applications
- Compressed air
- Fuel gases
- Fuel oils
- Fire defence / sprinklers