This specification covers porous nonreinforced concrete pipe for use in underdrains. Pipe manufactured according to this specification shall be of two classes identified as "standard porous nonreinforced concrete pipe", and "extra-strength porous nonreinforced concrete pipe. " The concrete shall consist of cementitious materials, mineral, aggregates, and water. The joints shall be of such design and the ends of the concrete pipe sections so formed that the pipe can be laid together to make a continuous line pipe. The aggregates shall be sized, graded, proportioned, and mixed with such proportions of cementitious materials, and water as will produce a homogeneous concrete mixture of such quality that the pipe will conform to test and design requirements. Pipe shall be subjected to curing. Special shapes or fittings for use with concrete pipe conforming to this specification shall be made of porous or nonporous concrete in such manner as will provide strength at least equal to the class of the adjacent pipe to which they are joined; and shall conform to all other requirements specified for pipe. The test pipe shall freed from all visible moisture. When dry, each pipe shall be measured and inspected. The crushing strength of the porous material as well as its infiltration, shall conform to the requirements.