The 67C Series is a Underwriters Laboratories (UL) listed high-pressure regulators that meets a variety of applications in liquid and vapor service. The compact body design makes the 67C Series particularly useful in installations with space limitations. The 67CH Series regulators come equipped with a handwheel adjustment. This series contains brass materials that are not compatible with anhydrous ammonia service. 67C Series regulators do not have an internal relief and should be installed with additional/external overpressure protection. These units should not be installed in fixed piping serving 14 in. w.c. / 35 mbar appliance systems.!!! WARNING !!! Failure to follow these instructions or to properly install and maintain this equipment could result in an explosion and/or fire causing property damage and personal injury or death. Fisher equipment must be installed, operated and maintained in accordance with Federal, state and local codes and Fisher instructions. The installation in most States must also comply with NFPA no. 54 and 58 standards. Only Personnel trained in the proper procedures, codes, standards and regulations of the LP-gas industry should install and service this equipment. BUYER AGREES THAT RESPONSIBILITY FOR PROPER SELECTION, INSTALLATION, USE AND MAINTENANCE OF ANY PRODUCT REMAINS SOLELY WITH THE PURCHASER AND END-USER. BUYER AGREES TO COMPLY WITH THE ABOVE WARNING AND ALL INSTRUCTION MANUALS, BULLETINS AND INSTALLATION GUIDES ASSOCIATED WITH THIS PRODUCT.