Kop-Flex® high performance or high speed disc couplings are available in four designs to accommodate all operating conditions and applications. In reduced moment with lowest overhung moment - RM with its interlocking (redundant) configuration, RZ allows lowest overhung moment at an economical price. Marine style - allows for installing and removing factory assembled center sections without removing the driving or driven end rigid hubs/adapters. MS offers the interlocking flanges, MP is the more economical option. KS disc coupling, is a sister to the Kop-Flex® high performance disc coupling, also designed to meet API 671 and provide a less expensive alternative for applications with intermediate speed range.