The RK3 HD is available in four sizes: Small

This compact first stage is a time-proven workhorse that has been embraced by the technical community around the world

this popular regulator ensures optimal hose routing while eliminating sharp bends

They can be configured in multiple ways to match the type of diving that you do

Everything a diver needs for a sidemount breathing system is found in this set

mtx r sidemount set dive regulator AccessoriesSafety The RK3 HD is availableThe MTX R sidemount set is a super tough, rugged, high performance, go anywhere sidemount regulator configuration designed to meet the rigours of cold water and extreme sidemount diving. The MTX R is highly reliable and also very easy to service out in the field which make it an ideal choice for the expedition and exploration diver.