Polybutylene fittings for hot and cold water. Tubing is designed to withstand continuous operation pressures of 100 PSI at water temperatures of 180° F. Fittings allow for complete and direct transition between polybutylene, CPVC, copper, and galvanized pipe. Fittings mechanically join to any water supply tubing utilizing a special locking ring and an elastomeric seal to make quick and easy watertight connections. Tubing is flexible. “Uncopper” tubing and fittings cannot be solvent welded. Joins 1/2" polybutylene, copper, or CPVC tubing to 3/8" polybutylene, copper, or CPVC tubing. Carded.