Panel Shell The panel mount dimensions are such that mounting interchangeability is possible with MIL-C-5015 connector sizes (see Compatibility table). The plugs may be front or rear mounted, with a maximum of 4mm panel thickness. Contacts are rear insert, and are held in place by the shells locking retention plate, they are available seperately, typically 220-2810 (1mm dia and 20AWG) or 175-3963 (1.6mm dia and 16 AWG). Sealing gaskets should be purchased separately typically 175-3985.