Large diameter corrugated plastic pipe

Abstract From the Canadian patent

Abstract, Non-releasable, molded, large-diameter corru-, gated plastic pipe having a wall structure made of high density polyethylene, PVC or polypropylene of sufficient thickness so as to be rigid but elastic and therefore relatively inflexible and having an integral automatically locking female coupling at one end and a cooperative male coupling at its opposite end, with access to its latching members at its exterior, and a method of manufacturing multiples thereof by a continuous molding process. The pipe has a corrugated wall structure. Only minor auxiliary cutting operations are required to separate portions thereof into individual plastic pipe sections each having, the …