A dental handpiece comprising: (a) a proximal end (b) a distal end, the distal end including an attachment for assembly of a removable workpiece (c) a handpiece body intermediate the proximal end and the distal end, the handpiece body having a gripping surface the handpiece extending in a substantially axial direction along an axis that includes a portion of the distal end, the handpiece body and a portion of the proximal end (d) a coupler including a cylinder portion and a supply-end portion, the cylinder portion assembled into the handpiece extending in the axial direction toward the distal end, the cylinder portion including at least one seal that interfaces with an interior of the body so as to isolate a portion of the body interior into at least one distinct chamber and wherein the supply-end portion of the coupler extends from the proximal end of the handpiece body at an angle from the axis, the supply-end portion including a plurality of outlets, the at least one distinct chamber in fluid communication with one of the outlets of the plurality of outlets.
