Abstract: A connecting joint construction particularly suited for use on large diameter corrugated plastic pipe or tubing. The joint is comprised of a first main length of corrugated, generally cylindrical plastic pipe having one end portion provided with corrugations which, considered from the interior of the pipe, are somewhat smaller in height than the corrugations of the main body portion of the pipe. One of the smaller corrugations has at least one locking area therein defined between a stop member and a locking member and the smaller corrugations further include a plurality of sets of axially aligned grooves formed therein. A second main length of pipe is provided with a smooth walled end portion of a diameter less than the minimum internal diameter of the one end portion of the first pipe.

Abstract: An alternator valve assembly particularly suited for below ground level use in septic systems for diverting flow from a single inlet to either of two separate outlets. The valve is comprised of a plastic housing which defines a valve chamber having an inlet, a pair of outlets, and valve plug seat means located in the housing adjacent each outlet. A rubber valve plug is adapted to be received in the valve chamber in one of the outlets to selectively block flow therethrough. The plug includes a sealing lip cooperable with the valve seat of the associated outlet and includes an elongated handle protruding outwardly of the valve housing to facilitate movement of the plug between blocking positions with each of the outlets. An outlet box defining a hollow outlet box chamber and having an exit area may be disposed in operative communication with each of the valve housing outlets.