Adapter Female NEVOC Type 30 For Helium

UNDERSEA is a UK-based manufacturer with decades of expertise in high-pressure gas handling equipment for technical diving and industrial applications. The 1130 adapter converts a NEVOC W30x2 female inlet — the standard cylinder valve thread for inert gases on modern 300 bar European helium bottles — to a G1/4 male BSP outlet with 60-degree cone seat, enabling direct connection to blending panels, manifolds, high-pressure hoses and gauges. Compliance with ISO 5145 Type 30 places this fitting squarely in the inert gas category, maintaining safe separation from oxygen (Type 32) and air (Type 31) circuits across the same fill station.

Technical Specifications

• Manufacturer reference: 1130
• Brand: UNDERSEA (UK specialist, high-pressure gas connectors)
• Inlet thread: NEVOC W30x2 female, right-hand (cylinder side)
• Outlet thread: G1/4 male BSP, 60-degree cone seat
• Compatible gases: helium (He), nitrogen (N2), argon (Ar) and inert gas mixtures
• Maximum working pressure: 300 bar
• Standard: ISO 5145, Type 30 — inert gases (He, N2, Ar)
• Material: brass — the industry standard for inert gas (He, N2, Ar) circuits; 316L stainless steel is reserved for oxygen service and highly corrosive environments, unnecessary for inert gas duty
• Net weight: 200 g
• Made to order — typical lead time 2-3 working days
• Dimensionally interchangeable with Tecnomar Type 30 and TDS Type 30 adapters (same W30x2 × G1/4 male 60° cone interface)

Applications

Designed for technical dive centres, advanced trimix divers and gas blending professionals who manage their own helium and nitrogen supplies. This NEVOC adapter fits seamlessly into cascade fill systems, trimix blending panels and portable fill rigs wherever a NEVOC W30x2 helium or nitrogen source connects to standard G1/4 downstream equipment. From North Sea wreck-diving operations that rely on trimix for sustained depth to Red Sea expedition centres supplying deep open-circuit divers, this is a staple fitting in any serious technical diving infrastructure. The ISO 5145 Type 30 designation is the cornerstone of safe gas management — on any correctly labelled fill panel, this adapter carries inert gas only, never oxygen.

Key Benefits

• ISO 5145 Type 30 dedicated to inert gases: thread geometry unique to helium, nitrogen and argon — cross-contamination with oxygen circuits is impossible by design
• Universal G1/4 male 60° cone outlet: direct, leak-free connection to the vast majority of diving blending panels, HP hoses and manifolds available across Europe and the UK
• Full 300 bar working pressure: supports modern high-pressure helium cylinder transfers as required in trimix and heliox configurations for deep technical diving
• UNDERSEA pedigree: a UK manufacturer whose high-pressure fittings are trusted in technical diving operations throughout Europe — precision machined to consistent tolerances
• Individual assembly to order: each unit built to specification on demand, ensuring dimensional accuracy and gas-tight integrity on every piece

Standards and Notes

This UNDERSEA NEVOC adapter conforms to ISO 5145 governing valve outlet connections for compressed, liquefied and dissolved gas cylinders. Type 30 identifies inert gas service (He, N2, Ar). This fitting is not personal protective equipment (PPE) under EU Regulation 2016/425 — it is a gas plumbing component for fill station infrastructure. Always refer to local pressure equipment and gas handling regulations for permanent installations.

Official Documentation