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 232 bar Double Valve 

• Double valve for two separate 1st stages 
• 2nd output can rotate 360 degrees 
• 232Bar DIN and INT fit 
• Made from 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
• The valve runs smoothly 
• In the valve are clearly engraved all important data