Parveen also manufactures Tubing Hanger Spools and Tubing Hanger Couplings. Tubing Hanger Spool is used in combination with Tubing Hanger Coupling, Wrap around tubing hanger (PTHSW) and 'PTHS' type tubing spool. Tubing Hanger Couplings allows installation by screwing the union nut of the tubing hanger couplings without a need to turn the X-mas tree. Coupling is threaded for installing a back pressure valve. Top & Bottom of the coupling can be threaded to suit customer's requirement.