Model Number Explanation SMAC prefix swivel model numbers shown may end with the letters LN. The letters at the end of the model number categorize the swivel according to the liquid/liquefied gas it is designed for. For other liquids/liquefied gases, please refer to the table below to determine the correct model number by adding the appropriate letters to the end of the model number.   Letters at end of SMAC-series model number Recommended for LN N CR FC LA LP-GAS, Natural Gas X         Anhydrous Ammonia   X       LP-GAS, Natural Gas, Refined Fuels     X*   X* Refined Fuels only       X   Other liquids/liquefied gases Contact our engineering department *CR option swivels contain corrosion resistant seals recommended where swivel may be exposed to moisture-laden air; cannot be used for Anhydrous Ammonia. Loading arm combinations are CR type swivels. After selecting the correct model swivel for the type of liquid/liquefied gas, add the letters CR to the end of the model number. Refined fuels include heating oil, jet fuel, gasolines, diesel fuels. JO-series swivels shown are for LP-GAS. Add the letters LN to the end of the model number for Anhydrous Ammonia. Temperature range: -40 degrees F. to +250 degrees F. Hydrostatic test pressure: 2000 psi Maximum working pressure: 400 psi Maximum rotational speed: 1000 RPM Approvals: U.L. Listed for LP-GAS, Anhydrous Ammonia, Natural Gas, Refined Fuels in accordance with the U.L.-567 Standard. Most swivel models and vent devices comply with the following European Directives: Pressure Equipment, Machinery, and ATEX. EC Declarations of Conformity and/or Declaration of Incorporation are available on request.