Regulator first stage for underwater diving

A regulator first stage for underwater diving comprising a regulator body, said body having a high pressure inlet connected to a high pressure chamber, a low pressure chamber having at least one low pressure port connected thereto, a piston mounted for reciprocal movement within said regulator, a passage extending longitudinally through said piston and connecting said high pressure chamber to said low pressure chamber, a high pressure port connected to said high pressure chamber and disposed at the end of said regulator body adjacent to said high pressure chamber, a valve seat for engaging the end of said piston to close off said passage, an opening extending through said valve seat in alignment with the passage extending through said piston, an additional low pressure port formed in said regulator body, passage means extending through said regulator body and connecting said additional low pressure port to said opening in said valve seat, whereby said additional low pressure port is connected to said low pressure chamber through said passage in said piston, at least a portion of the flow path between the end of said piston and said additional low pressure port being of smaller cross-sectional diameter than the passage through said piston, whereby the rate of flow to said vest is less than the rate of flow through the conventional low pressure port of said regulator, and means for removably connecting a vest inflator hose to said additional low pressure port.