Copper Coupling (or coupler) is a very short length of pipe or tube used in piping or plumbing, with a socket at one or both ends that allows two pipes or tubes to be joined together.

POLYOLEFIN / XPE FOAM INSULATION
Ecobrand Chemically Cross-linked Polyethylene (XPE) is a closed-cell insulation that is economically priced to benefit some customers. The product has a very low water and