P.e fittings are used to join/Put up the h.d.p.e pipes, lets say where you want to make a corner use Elbow, at the end you use Endcaps, to Divide water you use a Tee e.t.c . Our Blue black fittings are UV protected and are Gauge PN16 that can last 100yrs under sun. Come visit us or call to inquire.