New Crosman push in pump cup part #760-140, 760KB140. For models 760 760B 766 1322 1377 2100 2100A 2100B 2289 PC77 that use the push in style seal cup. This is part #760-140 in the 760B diagram, part #41 in the 2100B diagram and part #760-140 in the 1377 diagram. This the seal at the tip of the pump head assembly. OEM Crosman part. Pictures enlarged for easy viewing. Parts do not come with instructions.