1/2" rigid copper tube size x 50 feet, blue, pex coil, for cold water, use with 1/2" quick connect & brass pex insert fittings, w type b burst pex pipe rated 1,100 psi at 73 degrees fahrenheit, 375 psi at 180 degrees fahrenheit, type b silane method pex has more anti-oxidants & thermal stabilizers which is critical for chlorine ratings & recirculation systems, type a,b,c are european system designations not rating/grading system for pex, do not use duct tape, pipe dope, threading compound, mineral/linseed oil, support pipe every 30 inches vertically & horizontally, protect pipe when entering/exiting slab or walls, do not kink or expose to sunlight, minimum clearance to water heaters, boilers, wood burning appliances 18 inches, recessed lights 12 inches, gas appliance vents 6 inches, nsf-61 fda, csa/astm, upc listed/approved,