This Maintenance Kit contains the parts needed for servicing the MSR DragonFly Simmer Pump only. The kit contains 2 leather pump cups, 2 fuel filters, 1 fuel tube bushing, 2 pump screens, 1 small tube pump cup oil, 1 jet and cable tool, 1 air tube, 1 dip tube, 2 check valve balls, 2 check valve springs, 1 check valve plug, 1 poppet, 3 fuel bottle O-rings, 4 fuel tube O-rings, and 3 on/off valve O-rings.