Abstract: In a septic tank, an elbow pipe mounted therein and a keyway made in the top wall of the tank and longitudinally aligned with a circular opening formed in an end wall adjacent the top wall of the tank. The elbow pipe has a key adapted for outward sliding engagement in the keyway. The elbow pipe fits within a sealing gasket adapted to snap into the circular opening of the end wall and its end portion is threaded. A connector sleeve is screwed on the end of the elbow to secure the elbow within the gasket and to receive a drain pipe glued within the sleeve.

Abstract: There is disclosed an interlocking assembly for floating dock units of quadrangular section, comprising eye lugs, outwardly projecting from the four corners of the floating units. The lugs are superposable one over the others at the junction of four adjacent floating units. A bolt is provided, including a head and a threaded spindle with an associated nut. The bolt spindle is engageable through the eye of each lug for connecting the four adjacent floating units. The nut has inturned guide flanges releasably engaging the lowermost lug for holding the nut in register with the lug and for preventing its rotation when the bolt is screwed within the nut. Bumpers and cleats are also provided and secured to exposed lugs around the dock.