Description of waterproof connector: 
M12 connectors with screw threaded joint, circular connector, waterproof rating is IP67. 
Protected from dust and water during immersion, resistant to many oils and chemical. 
Professionally for inductive or capacitative proximity switches, sensor devices and actuator devices. 
Plug design as per IEC 61076-2-101
M12 a /b/c/d coding assembly connector
Connector series: M12
Coding: A /b/c/d
General information: 
Standard: IEC 61076-2-101 ED 3.0
Connector body: PA66+gf or TPU
Connector contacts: Brass with gold plated
Shell/nut: Brass with nickel plated
Insulation resistance: ≥ 100m
Waterproof rating: IP67/IP68