Abstract: An open end of a standard pipe fitting is enlarged in diameter to coaxially receive an O-ring and a retainer having a cylindrical surface. A plurality of locking teeth project from the cylindrical surface and are engageable with both the inner surface of the fitting and an outer surface of a pipe end inserted coaxially into the fitting open end. Each of the locking teeth have oppositely disposed edges facing obliquely inwardly and outwardly to engage both the pipe end and the fitting and resisting motion of the pipe end relatively to the fitting. In an alternate embodiment, a first plurality of teeth each have an edge facing obliquely inwardly of the fitting to engage the pipe end and resist motion tending to withdraw the pipe end from the fitting. A second plurality of teeth each have an edge facing obliquely outwardly of the fitting and resist motion tending to withdraw the retainer from the fitting.

Abstract: An elastomeric gasket for a pipe coupling having a dry lubricating film of an aqueous solution of a lubricant and a film-forming polymer adhered thereto.

Abstract: An elastomeric seal for incorporation into a pipe coupling includes a fire-ring which acts to retain a residual portion of a radial flange of the seal in sealing relationship with the pipe ends in the event of thermal destruction of the remainder of the seal.

Abstract: A seal assembly for incorporation into a pipe coupling has a fire-ring which is adapted to seal against the juxtaposed ends of pipes and provide a substantial seal between the pipe ends in the event that the body of the elastomeric seal is subjected of thermal destruction.

Abstract: The invention provides a junction coupling for branching a flow of fluid from a pipe or conduit. The junction coupling is essentially C-shaped and is dimensioned partly to surround such pipe or conduit. Opposite limbs of the C-shaped member carry, on the one hand, an outlet duct and on the other hand means for securing the coupling in position on the pipe or conduit. The outlet duct is alignable with an aperture in the conduit wall and adapted to receive a branch conduit. The dimensions of the C-shaped member are such that the coupling may be engaged over the pipe or conduit only at the location of the aperture therein.