Pressure cap goes on the end of an iem downrun cable assembly part number lb1500
NSN 6110-00-111-2761
NSN 6320-00-583-3104
NSN 5855-01-414-6265
NSN 7035-01-494-7013
NSN 5985-01-341-8767
NSN 6220-01-571-9995
NSN 5990-00-110-9441
NSN 6650-01-231-9545
NSN 7035-01-474-2768
NSN 5915-01-208-9179
NSN 6110-00-926-0781
NSN 5990-00-197-0159