You are welcomed to wholesale or buy customized bottom cap in stock and get bottom cap free sample from us, which is one of the best end cap manufacturers and suppliers. Bottom cap(end cap) Bottom cap: A bull nose or plug is always attached to the bottom of casing and screen strings installed in gravel envelope wells. Semi-elliptical tank ends, readily available and inexpensive, provide a convenient fulfillment of this requirement.it also called bottom plugs or end cap.