XS Scuba Pony Regulator System. 

Features: 

• Compact, DIN 1st stage uses flow-by piston design
• One HP and 2 MP ports
• Highland Mini Tech Gauge is made of brass (0-5000 psi) w/ rubber boot
• Miflex yellow hose is 40” long
• Compact, low profile AltAir features single pull release X-Lock buckle (patented)