Washing machine or ice maker outlet box installation with torque inhibiting water supply connection

A plumbing installation, comprising:

• a drywall panel having a rectangular cut-out;
• an outlet box mounted in the cut-out of the drywall panel, the outlet box having an outwardly opening interior and a horizontally extending bottom wall with a water supply hole extending therethrough;
• a vertically extending CPVC water supply pipe having an upper end extending through the water supply hole in the bottom wall of the outlet box;
• a boiler drain valve positioned in the interior of the outlet box and having a male threaded lower shank in which the upper end of the water supply pipe is seated and a handwheel which may be manually rotated to turn the valve ON and OFF;
• and
• means for connecting the water supply pipe to the boiler drain valve to thereby inhibit the transmission of torque to the water supply pipe resulting from rotation of the handwheel including a ferrule surrounding the upper end of the water supply pipe, a compression nut screwed over the male threaded lower shank of the boiler drain valve to compress the ferrule around the upper end of the water supply pipe, a male threaded cylindrical adapter connected to, and extending downwardly from, the compression nut through the water supply hole and surrounding the water supply pipe, and a plastic lock nut screwed over the male threaded cylindrical adapter to squeeze the bottom wall between the compression nut and the lock nut.

A pre-assembled combination outlet box, drain valve and stub pipe, comprising:

• an outlet box having an outwardly opening interior and a bottom wall with a water supply hole extending therethrough;
• a CPVC stub pipe having an upper end extending through the water supply hole in the bottom wall of the outlet box;
• a valve positioned in the interior of the outlet box and having a male threaded lower shank in which the upper end of the CPVC stub pipe is seated and a handwheel which may be manually rotated to turn the valve ON and OFF;
• and
• means for connecting the stub pipe to the boiler drain valve to thereby inhibit the transmission of torque to a water supply pipe to which the stub pipe can be adhesively connected, the torque resulting from rotation of the handwheel, including a ferrule surrounding the upper end of the stub pipe, a compression nut screwed over the male threaded lower shank of the boiler drain valve to compress the ferrule around the upper end of the stub pipe, a male threaded cylindrical adapter connected to, and extending downwardly from, the compression nut through the water supply hole and surrounding the stub pipe, and a lock nut screwed over the male threaded cylindrical adapter to squeeze the bottom wall between the compression nut and the lock nut.

A method of connecting a CPVC water supply pipe to a boiler drain valve positioned inside an outlet box, comprising the steps of:

• sliding a lock nut over an upper end of the CPVC water supply pipe;
• inserting the upper end of the CPVC water supply pipe through a water supply hole in a bottom wall of the outlet box, a diameter of the water supply hole in the bottom wall being less than an outer dimension of the lock nut so that the lock nut cannot pass through the water supply hole;
• sliding a co-axially joined compression nut and male threaded cylindrical adapter over the upper end of the CPVC water supply pipe, an outer diameter of the male threaded cylindrical adapter being less than the diameter of the water supply hole in the bottom wall and an outer dimension of the compression nut being greater than the diameter of the water supply hole so that the compression nut cannot slide through the water supply hole;
• sliding the cylindrical adapter through the water supply hole in the bottom wall of the outlet box;
• sliding a ferrule over the upper end of the CPVC water supply pipe;
• inserting the upper end of the CPVC water supply pipe into a male threaded lower shank of the boiler drain valve;
• screwing the compression nut over the male threaded lower shank of the boiler drain valve to compress the ferrule against the upper end of the CPVC water supply pipe to thereby provide a leak-proof connection between the boiler drain valve and the CPVC water supply pipe;
• and
• screwing the lock nut over the male threaded cylindrical adapter and tightening the lock nut to squeeze the bottom wall of the outlet box between the compression nut and the lock nut;
• whereby the tightening of the lock nut against the bottom wall of the outlet box will substantially inhibit the transmission of torque to the water supply pipe otherwise resulting from manual rotation of a handwheel of the boiler drain valve.