HammerHead’s Brawoliner is a seam-free textile pipe liner constructed with a loop design providing extreme flexibility. It can adjust to bends of up to 90° and to single changes in pipe dimensions without creating any wrinkles or folds. Offered for pipe sizes of 2” to 10” in diameter, it consists of a lengthwise and transversal elastic polyethylene terephthalate textile tube coated with polyurethane foil. Wall thickness uncured is 0.16” and nominal wall thickness impregnated and cured is 0.12”. With an inversion pressure as low as 3 psi, it does not cause further stress on the pipe. HammerHead Trenchless Equipment.