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UNDERSEA 1074-1080BN helium adapter connects a helium female port (W 24.32x14 LH, DIN 477-10) to a UK Bullnose female connection (G5/8, BS 341-3) for high-pressure gas transfer in technical diving.
✓ Chrome-plated brass · BS 341-3 UK Bullnose · DIN 477-10 · UK-manufactured since 1970
Designed for Trimix blending stations, helium cascade systems, and professional technical dive workshops.
Return possible within 14 days for private customers.
Terms & Conditions →Founded in Southampton in 1970, UNDERSEA Ltd has spent over five decades designing and manufacturing high-pressure gas fittings for the professional diving and mixed-gas industry. The 1074-1080BN compound fitting bridges a helium female port (W 24.32x14 LH thread, DIN 477-10) to a UK Bullnose female connection (G5/8 thread, BS 341-3 Type 3), providing a reliable interface between two internationally recognised gas cylinder standards used by technical diving teams and commercial operations worldwide.
This high-pressure fitting is purpose-built for helium cascade systems and gas blending stations used in technical diving with Trimix, Heliox, and Heliair mixtures. It connects equipment fitted with a DIN 477-10 helium female port — manifolds, fill whips, pressure regulators, or blending panels — to helium storage cylinders fitted with UK Bullnose (BS 341-3) valves. Widely specified in technical dive centres, commercial facilities, and rebreather service workshops across the UK, Australia, and wherever the BS 341-3 standard applies. Essential kit for any mixed-gas operation handling helium in Trimix or Heliox blending.
This adaptor conforms to BS 341-3 (connections for transportable gas cylinders — UK Bullnose Type 3, 60° cone seat, G5/8 thread) and DIN 477-10 (W 24.32x14 LH helium thread). UNDERSEA Ltd designs all products to British and DIN standards from its Southampton manufacturing facility. This is an industrial gas fitting — no PPE (personal protective equipment) certification applies. Responsibility for compatibility with the specific gas installation rests with the qualified technical operator.
UNDERSEA 1074-1080BN helium adapter connects a helium female port (W 24.32x14 LH, DIN 477-10) to a UK Bullnose female connection (G5/8, BS 341-3) for high-pressure gas transfer in technical diving.
✓ Chrome-plated brass · BS 341-3 UK Bullnose · DIN 477-10 · UK-manufactured since 1970
Designed for Trimix blending stations, helium cascade systems, and professional technical dive workshops.