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.The KS disc coupling is a sister to the Kop-Flex® high-performance disc coupling. It is designed to meet API 671. It provides a less expensive alternative for applications with intermediate speed range.