Plug for hydrostatic testing of flexible polymeric pipe or tubing

A polymeric plug for one-time use in hydrostatic pressure testing of polymeric pipe or tubing having an open end and flexible inside and outside walls, the plug comprising:

• a first element further comprising a substantially rigid polymeric handle with a plurality of radially extended wings and a threaded polymeric cylindrical section disposed in fixed relation to the handle, the threaded section being engageable with the open end of the polymeric pipe or tubing;
• and
• a second element coaxially aligned with and supported by the first element, the second element further comprising an elastomeric sealing member that extends forwardly of the first element and is insertable into the open end of the polymeric pipe or tubing, the elastomeric sealing member comprising a plurality of axially spaced-apart annular polymeric sealing surfaces that provide a fluid seal between the sealing member and the inside wall.