Abstract: Method and apparatus for internally applying fluid pressure in order to determine the leak resisting characteristics of pipe, by gravitating a pipe into an elongated upwardly opening trough filled with a noncompressible fluid, such as water. The pipe is supported submerged within the trough and below the liquid level thereof such that opposed seals can be lowered into the trough, reciprocated towards one another and into engagement with the opposed ends of the filled pipe. Hence, the seals isolate the pipe interior after the pipe has been filled with the non-compressible fluid. The internal pressure of the pipe is increased and held for a finite period of time, thereby determining the rate at which the noncompressible fluid escapes from the pipe interior. The seals are released from the pipe ends, the fluid drained from the pipe and back into the trough, and the tested pipe is then removed from the apparatus.