This N jack is bulkhead type and has sealing O-ring. The N bulkhead jack type is with washer and nut to mount this N connector on panel sheet. The sealing O-ring can resist dust or moisture from outside.
RG188 have similar dimensions as RG174, RG316, LMR100 coaxial cable, so we provide same N jack bulkhead w/O-ring connector (PN#C28CEWS174002D) for RG188 coax cable.
N straight bulkhead jack cable connector is nickel plating and popular with 50 ohm. It can be crimped with RF cable like RG174, RG316, LMR100, RG188 and RD316.
Please link N connector jack straight bulkhead w/O-ring crimp for RG174 coax cable to get drawing of C28CEWS174002D.