DCC Dry Cryogenic Couplings DCCs, Dry Cryogenic Couplings, employ the same design principles as our Dry Disconnect Couplings, which have been in use for more than 25 years. Our Dry Cryogenic Couplings have been tested under cryogenic conditions by connecting and disconnecting over 10,000 cycles. With more than 25,000 LNG transfers having been completed using Manntek DCCs, they are considered by operators worldwide to be the safest in the market. These couplings are used for ship to ship transfer, LNG Bunkering, marine applications, filling tank trucks and LNG containers. The proven self-sealing valve design enables quick connection and disconnection while protecting operators, the environment and equipment from dangerous liquids and vapours. The Manntek DCC is designed to be compliant with both ISO 18683 and the new ISO 21593