A solvent is applied to PVC, CPVC, ABS or other plastic piping to partly dissolve and fuse the adjacent surfaces of piping and fitting. Solvent welding is usually utilised by using a sleeve-form joint to attach pipe and fittings fabricated from the exact same (or compatible) content. in older installations, http://needlevalve48134.aioblogs.com/18255199/what-does-valves-and-fittings-mean