Abstract: An improved drainage field pipe is disclosed which is a cylindrical tube of substantially circular cross section composed of an organic polymer material, having a principal axis slightly inclined with respect to the horizontal, for conducting a fluid slurry containing solid particles from a source connected to the inlet thereof, to be dispersed along the lower side of the tube into a subterranean drainage trench lined with crushed rock. A plurality of slots perforate the tube along the lower side thereof, with each slot having its length dimension greater than its width dimension. The slots allow the solid particles from the fluid slurry to pass out of the tube into the drainage trench while preventing the crushed rock from passing from the drainage trench into the tube.

Abstract: An improved sanitary diversion valve is disclosed which provides a better seal to plastic sanitary pipe, is corrosion resistant, has an improved valve core retention mechanism, and a sealed access to prevent leakage and tampering. A resilient O-ring core retention mechanism maintains the core in close contact with the housing without being susceptible to corrosion. Plastic coupling rings are molded into the inlet and outlet ports of the housing to enable high integrity seals to be formed with plastic sanitary pipe connecting therewith. In addition, a plastic coupling ring is molded around the core shaft port in the housing to enable sealing a plastic sanitary pipe thereto as an access tube to the valve. The resulting improved sanitary diversion valve is easily fabricated, easy to install, provides a high integrity seal with plastic sanitary pipe connecting thereto, is reliable for withstanding corrosion of its moving parts during a long term of operation, and is leakage and tamper proof.