FQ series waterproof circular connectors accord with the standard DZ4Q/RE008-84，whlch is certificated by Ministry of the electronics industry-adminlstratlve bureau office.The Product owns advancedstructure，hlgh dependability small volume，light weight，excellent waterproof，and the bayonets are connected qulckly.The pins and the down-lead of jacks are made by welding.Asthese characte ristlcs，it’s easy to operare and it make a low price whlch is more-reasonable.it was widely used in electric connection among various kinds of electric equipments