4.0" Nominal Size Expansion Drain Plug (Unexpanded Size 3.540" - Expanded Size 4

Constructed of unbreakable nylon with expandable neoprene seal. Seven sizes fit schedule 40 and/or 80 pipe or tubing with I.D.'s from 1.5" to 6". Hand tightening of wing nut expands rubber seal to withstand pressures up to 42 psi in steel pipe. Will not rust or corrode. Easy to clean. Unlimited applications for bleeding or feeding liquid or gas lines. End of plug has a hollow vent stem with threaded 1/2" MNPT with removable cap on 1.5 size and larger. Smaller sizes have a solid stem. Available also are 1/2" I.D. tubing connectors with each end threaded 1/2" FNPT.