Abstract: A watertight slide fastener comprises a resilient bifurcated seal member mounted on opposite stringer tapes adjacent to one end of a pair of rows of coupling elements and snugly receivable in a Y-shaped guide channel in a slider body. The seal member has a pair of resilient tongues extending from said one end of the rows of coupling elements along opposed inner longitudinal edges of the stringer tapes and a head interconnecting the tongues at their upper end so as to define therebetween a first slot or facing opening toward said one end of the rows of coupling elements and snugly receptive of a neck of the slider body when the slider is in its uppermost position. The tongues have outer sidewalls sealingly engageable with side flanges of the slider body and opposed inner sidewalls sealingly engageable together when the slider is in the uppermost position.

Abstract: A water-resistant slide fastener stringer has a stringer tape including face and back layers of resilient and water-resistant elastomer, a row of coupling elements mounted on the stringer tape along one longitudinal edge thereof, and layers of resilient and water-resistant elastomer integral with the face and back layers and including portions interconnecting adjacent ones of the coupling elements and having lateral slots extending transversely of the stringer tape. The coupling elements are securely fastened to the stringer tape by the resilient and water-resistant layers. The stringer is kept relatively flexible by the slots in the layers extending across the coupling elements.