The MK2 is Scubapro’s entry level 1st stage, a classic downstream piston design. A first choice of resorts and rental facilities worldwide. This is the best example of bulletproof reliability and trouble-free, minimal maintenance regulators. If you want a no fuss regulator, with solid performance and reliability, then this is the reg for you. There are cheaper, inferior products on the market, but none will give the length of service this regulator has become famous for. You can expect this reg to last a lifetime of recreational diving.