FQ water-proof type round connector accord with the ministry of industy standards DZ4Q/RE008-84.it has advanced form,high safety,small cubage,light weight, fast connection with snap fastener,good water-repelent capability,low price and easy operation. The down-lead wire of the contact pins and jack adopted welding.the productions are widely used to connect with many electric equipments and instruments,which should be water-proof. The contact pins and jacks can be exchanged according your request.