Apeks cylinder valves. Apeks makes in their own factory in Blackburn (UK) high valves for diving. All valves  are made from one solid piece brass and manufactured in its own factory and finished. This provides very good finished tank valves of excellence. 

Apeks 300 bar cylinder valve expandable with 2nd valve 

• LH version, can be expanded with a 2nd valve on the left 
• RH version, can be expanded with a 2nd valve on the right 
• 300bar DIN execution 
• Made out of one solid piece brass in own factory 
• M25 thread 
• Robust design 
• Soft grip, shockproof dial with a metal frame 
• Brass rigid tube 
• Space for spare o-ring in the rubber knob 
• Very high quality finish 
• Valve running smoothly 
• In the valve are clearly engraved all important data