Connecting rigid pipe and tubing requires fittings. VMS sells threaded fittings and nipples in copper, stainless steel, galvanized and black malleable in both schedule 40 and 80, no lead brass or bronze and copper sweat fittings. We also carry PVC and DWV.  Value Maintenance Supply stocks Viega Pro Press and Mega Press. We also carry Pex fittings in poly and brass barbed as well. Our push fit style fittings are from Sharkbite and John Guest.
Soft tubing, copper or poly, sometimes requires a compression or flare fitting for connection to valves or appliances. VMS stocks no lead rough and chrome plated brass compression fittings, rough brass flare fittings and a wide variety of plastic compression fittings in nylon material.
Check out this section for all your pipe and tubing connections.