Reddy Heater two-stage pressure regulator is recommended for use with Propane/LP fueled indoor heating appliances on 100 lb. cylinders or larger. The two-stage regulator results in a consistent inlet pressure to the second stage, thereby minimizing minor outlet pressure variations from the second regulator. Regulator specifications: Propane 160,000 Btu/hr, inlet 1/4" FNPT, outlet 3/8" FNPT. Follow appliance manufacturer"s installation instructions. This regulator must be installed in compliance with federal, state, local codes and laws, and in accordance with NFPA/ANS 58, Storage and Handling of Liquefied Petroleum Gases. If you have questions about installation, operation, or troubleshooting, contact DESA International"s Technical Service Department at 1-866-672-6040.