The round series of watertight connectors have 4 different size covers, the maximum number of needle cores is 16 cores, the working voltage is 300~600V, and the working current is 5~15 Amp; The working depth reaches 14,000 meters.

A standard connector plug with cable, socket, locking lid and waterproof plug, adopt high grade neoprene and naval brass material, with flexible waterproof SOOW cable behind most of the plug, socket, followed by single strands of pig tail wire, teflon skin lock cover use poly formaldehyde resin casting and become, use with the elastic clamping ring of stainless steel. The cable plug and lock cover can also be used with the metal casing series connectors, and the standard round 2-12 core connectors can be used for on-site curing and installation.

The system product can be plugged and uncharged underwater. In China's underwater scientific research and ocean projects over 1000 meters, more than 60 percent of the connectors are of this type.