Abstract: A dispensing container for liquid wherein the total of all of the internal forces operating on the liquid and tending to cause it to flow from a passageway in the container is overcome when the container is at rest by the total external forces acting upon the container, but wherein the total internal forces exceed the external forces when the liquid within the container is placed in motion to cause the dispensing thereof.

Abstract: A resilient gasket adapter to form a tight seal between pipes, said gasket having a plurality of projections which interact with cooperating pipe structure to retain the gasket in position as pipes are joined. This gasket overcomes the problem of fishmouthing, a situation in which a gasket is pushed out of a retaining groove as pipes are joined.

Abstract: An improved plastic composite pipe structure includes an outer corrugated pipe, an inner smooth-walled liner, and joining means including a bell fitting at one end of the liner extending beyond the outer corrugated pipe and a spigot fitting at the other end. The corrugations of the outer pipe at the spigot end are undercut so as to slide over and provide crush resistance to the joint that is formed when the spigot of one composite pipe section is inserted into and engaged with the bell of an adjacent composite pipe section. A seal, for example, an elastomeric gasket, solvent weld, or elastomer-based adhesive is used to provide a leakproof joint. Optionally, an outer pipe cover can be utilized as a component of the composite pipe.