Lansas high pressure test plugs made from a specially formulated, natural ozone-protected rubber impregnated 
with several layers of nylon cord. The number of layers 
is determined by pressure resistance required in the field.
The bladder portion of the plug is bonded to its metal inner mandrel. The ends of the bladder, when inflated, roll up to
the interior of the pipe walls, giving the plug more sealing surface and less stress on the bladder by not having to
stretch as far, thus adding to the strength of the plug.

Lansas high pressure test plugs have been field tested 
to withstand pressures in excess of several hundred PSI.
Like other Lansas products, the roll-up plugs can be manufactured to fit specific applications.