Abstract: A body portion has a finger grip aperture therein and a slot on the forward edge arranged to receive a bowstring. A catch assembly pivotally supported on an upright axis extends into the slot and has a first position arranged to hold the bowstring in the release device and a second position arranged to release the bowstring. A trigger is mounted on the top of the body portion and operates an upright pin slidable in the body portion between a first position behind the catch assembly to hold the catch assembly in holding engagement on a bowstring and a second position disengaged from the catch assembly for allowing the latter to pivot and release the bowstring. The front of the body portion has a bore for receiving an arrow nock, such bore being of a size to also receive a bowstring nock stop. The slot which leads in from the front end of the body member is of less width than the bowstring nock stop whereby the release device will hang on the string nock stop for ready use.

Abstract: A tubular housing made up of a pair of sections forms a tubular inner compartment of a cross dimension larger than the outer diameter of a pipe in which water is to be frozen. The housing has opposite flanges arranged to be abutted together and bolt fasteners are provided in the flanges for releasably securing the housing sections together for installing and removing them laterally on a pipe. The end walls of the housing have openings arranged to fit around the pipe on which the housing is mounted and such openings have seals to provide a sealed engagement with the pipe. An inlet for freezing material extends into one side of the housing adjacent one end of the latter and an outlet for gas from the freezing material extends from the housing on the same side as the inlet and adjacent the other end of the housing. The two housing sections are symmetrically constructed whereby the inlet will be in one of the sections and the outlet will be in the other section.