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Fitting Gas
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The UNDERSEA 1425 adapter bridges the 1/2 NPT to G1/4 thread gap. It connects US-standard diving gas equipment directly to European high-pressure circuits without additional couplings.
✓ 316 A4 stainless steel · 1/2 NPT male × G1/4 male · High-pressure rated · UK-made
Designed for dive facilities and gas technicians integrating NPT and G1/4 equipment.
The UNDERSEA 1263 adapter connects a G1/4 female gauge thread to the 3/8 UNF LP port of a first-stage regulator, bridging European BSP and international UNF standards.
✓ CNC chrome brass · G1/4 female × 3/8 UNF male · PTFE seal · O2 compatible
Essential for regulator service workshops, technical divers, and gas blending stations handling mixed-standard diving equipment.
The UNDERSEA 1068 adaptor resolves the thread mismatch between G1/8 BSP female connections — found on older Poseidon Cyklon first stages and some European manifold gauges — and the 3/8-24 UNF male low-pressure ports of modern regulators, in a single chrome-plated brass fitting.
✓ Chrome-plated brass · G1/8 BSP female / 3/8 UNF male · Poseidon Cyklon compatible · Made to order · UNDERSEA Ltd Southampton
Suitable for LP hose connections, gas filling panels, and mixed-standard manifolds in technical diving infrastructure.
UNDERSEA 1261 converts a G1/4 BSP female gauge connection to a 7/16-20 UNF male high-pressure regulator port in a single precision brass fitting.
✓ G1/4 female × 7/16-20 UNF male · PTFE seal · O2 compatible · British & DIN Standards
Essential for regulator service workshops and technical diving fill station setups. Must be greased before installation to protect seals.
✓ Chrome-plated brass · G1/4 BSP male 60° cone · 7/16 UNF male · HP rated · Ref. 1266
Connects regulator first stages, HP gauges and compressor manifolds across BSP and UNF thread standards.
The UNDERSEA 1235 is a chrome-plated brass G1/4 BSP male-stud-to-female swivel designed to align valves and distribution blocks in dive centre fill stations and compressor manifold panels.
✓ Chrome-plated brass · G1/4 BSP (gas) threads · Male stud × Female swivel · Valve alignment · Not for charging hose ends
Manufactured by UNDERSEA Ltd (Southampton, UK) to British and DIN standards.
The UNDERSEA 1260 gauge adapter connects a G1/4 BSP female gauge port to a G1/4 BSP male fitting or block in high-pressure diving gas systems.
✓ G1/4 BSP female × male · Chrome-plated brass · PTFE seals included · HP rated to 300 bar
Assembled to order by UNDERSEA (UK), dispatched within 2–3 working days.
UNDERSEA ref. 1269 chrome-plated brass adapter: G1/4 BSP male to Bauer M16×1.5 male, allowing Bauer HP fill hoses to connect directly to any G1/4 BSP female-threaded high-pressure equipment.
✓ G1/4 BSP male · M16×1.5 Bauer male · Chrome-plated brass · 300 bar HP
Standard fitting for technical dive operations, fill stations, and professional dive centres running Bauer compressor systems.
UNDERSEA precision fitting: converts any G1/4 female BSPP gauge port on a cylinder valve or manifold into a male Snap Tite quick-connect for LP inflation hoses, using an oxygen-safe PTFE seal.
✓ G1/4 female BSPP · PTFE seal (O₂/nitrox safe) · Male Snap Tite · Chrome brass · Ref. 5051
Part assembled to order by UNDERSEA Centre Ltd since 1974 — designed to BSI and DIN standards, ISO 228-1 thread.
The UNDERSEA 3082 HP T-swivel routes high-pressure flow from a single compressor or cascade supply to two simultaneous G1/4 outlets, rated to 300 bar working pressure.
✓ 3×G1/4 BSP ports · 300 bar WP · Precision brass body · Free 360° swivel rotation
Standard reference for dive centre filling stations, liveaboard operations and high-pressure cascade systems.
The UNDERSEA 1268 gauge adaptor converts a G1/4 BSP male flat-face port to a 7/16 UNF female connection for high-pressure diving gas installations; a PTFE washer is supplied for immediate flat-face sealing.
✓ G1/4 BSP male · 7/16"-20 UNF female · Chrome-plated brass · PTFE washer included
Engineered to British and DIN standards for fill stations, gas panels, and technical diving equipment.
The UNDERSEA 1265 nickel-plated brass adapter connects a G1/4 male BSP parallel (flat seat) fitting and a G1/4 male 60° conical seat fitting, rated to 300 bar. The right solution for bridging incompatible G1/4 connections on any fill station or breathing gas panel.
✓ Nickel-plated brass · BSP flat / 60° cone · Max 300 bar · 200 g · BS 2779 / ISO 228-1
The UNDERSEA 1264 fitting bridges a G1/8 male BSP connection to a G1/4 male BSP high-pressure port via dual 60-degree cone seats delivering a dry metal-to-metal seal without thread sealant or PTFE tape.
✓ Chrome-plated brass · Dual 60° cone seats · 300 bar HP · G1/8 + G1/4 BSPP
Essential for technical diving service workshops and the assembly of Nitrox or Trimix gas blending panels.
The UNDERSEA 1262 chrome brass adapter connects any G1/4 female pressure gauge to the G1/8 HP port found on Poseidon first stages.
✓ Chrome brass body · G1/4 female x G1/8 male BSP · PTFE seal included · British-made precision fitting
Service component for Poseidon regulator configuration and maintenance.
The UNDERSEA 1437 bridges a JIC-6 male connection (9/16-18 UNF, 37° flare, SAE J514) to a fixed G1/4 BSPP female port, enabling reliable high-pressure plumbing in mixed-standard dive fill stations.
✓ JIC-6 male 9/16-18 UNF · G1/4 BSPP fixed female · 316 A4 stainless steel · ~275 bar WP
✓ G1/4 male × 3/8 UNF male · Machined brass · LP port · Ref. UNDERSEA 1267
Essential for regulator servicing, mixed-standard configurations, and technical diving kit rooms.
✓ 3/8 UNF threads · 232 bar max WP · Chrome-plated brass · Made in UK since 1970
Suitable for air, nitrox and trimix circuits across the full range of European technical diving configurations.
The UNDERSEA 1265-R restricts gas flow through a calibrated 0.3 mm orifice. It protects the diver wearing a drysuit if the low-pressure inflation hose ruptures during a dive.
✓ G1/4 BSP male/male · 0.3 mm flow restrictor · CNC chrome brass · British and DIN Standards
The UNDERSEA 3084 G1/4 swivel elbow bends a high-pressure gas line through 90° while both thread ends rotate freely — the right solution for routing regulator hoses and pressure gauges in cave, sidemount and technical rig configurations without loading adjacent fittings.
✓ G1/4 male × female · 300 bar WP · Chrome-plated brass · BS/DIN · Dual free-rotation
Precision HP fitting for twinset manifolds, mixed-gas fill stations and rebreather high-pressure gas-feed assemblies.
The UNDERSEA 1227 hexagon body brings four G1/4 BSP female outlets together in a chrome-plated brass block measuring 50 × 28 mm, built for high-pressure diving fill station panels.
✓ 4 × G1/4 BSP female · Chrome-plated brass · 232 bar service · 50 × 28 mm body
High-pressure distribution component for air and nitrox filling stations — part assembled to order.
✓ 316 A4 stainless steel · JIC-6 female swivel nut · G1/4 BSP male · British & DIN standards
Core fitting for gas blending panels, compressor manifolds and fill station hose connections — air, nitrox and trimix service.
UNDERSEA ref 1415 straight adapter in 316 A4 stainless steel, connecting JIC-6 male (9/16-18 UNF, 37° flare) to G1/4 BSP male — the universal diving industry thread standard throughout Europe.
✓ 316 A4 stainless steel · JIC-6 (9/16-18 UNF) male · G1/4 BSP male · British & DIN standards
Essential for gas blending panels, nitrox/trimix fill stations and JIC-to-BSP conversions.
The UNDERSEA 1438 is a straight male-to-male adaptor connecting a JIC 8 (AN-8, 3/4"-16 UNF) port with a 37° conical seat to a G1/4 male BSPP parallel-thread port — chrome-plated brass, rated to 300 bar, manufactured in the UK to British and DIN Standards.
✓ Chrome-plated brass · JIC 8 AN-8 3/4"-16 UNF conical seat · G1/4 BSPP ISO 228-1 · 300 bar HP
The standard fill-station solution wherever AN-8 compressor outlets must interface with European BSPP gas distribution networks.
The UNDERSEA 1402 converts a JIC-4 female swivel nut to a G1/4 male BSP thread, connecting JIC-terminated fill whips directly to G1/4 charging panels, valves and gauges in professional diving fill stations.
✓ JIC-4 swivel nut · G1/4 BSPP male · 232 bar WP · Brass · UK-made since 1979
High-pressure fitting for air, nitrox, helium and trimix fill stations in technical diving.