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 provides 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.