Abstract: The present invention is a rotary coupling including an annular outer section which has a female end, a threaded portion, and a Z-ring relief; a connector pipe which has a connection end, a shoulder, and a seal end; a Z-ring housed within the Z-ring relief and packing seals housed within a packing chamber; and a retainer ring threadably received into the threaded portion of the outer section. This retainer ring receives compression screws there-through, wherein in the engaged position the compression screws urging a packing end of Z-ring longitudinally against packing seals thereby compressing the packing seals into the packing chamber creating a seal. In one embodiment, the rotary coupling features compression screws which are moveable between an engaged and disengaged position in order that in the dis-engaged position the compression pressure against the z-ring and packing seals is released by backing off the compression screws without disassembly of the rotary coupling.