Two-piece Thermoplastic Rubber Lid and Plug complete - for 48 oz. / 1.4 Ltr. Polycarbonate/Stackable Container - 1 per standard pack, 4.8 oz. / .14 kg This is the Lid for the Standard 48oz Container not the XP 48oz container. See Part # 15574 if you are looking for the MP Lid.