The MEC Sentinel Series Full Size Dielectric Inlet Second Stage Regulator features an integral dielectric inlet connection designed to isolate upstream metallic piping from electrical current prior to piping entering a building in compliance with NFPA58 – 2017 section 6.11.316. Since the FNPT inlet serves as the dielectric separation media, any standard MNPT threaded connector or valve can be installed without a separate dielectric union. Both compact and full size models feature the same basic footprint measurement from inlet to outlet.Type: second stage3/4 in. x 3/4 in. inlet and outlet900,000 BTU capacity11 in. WC outlet set point Proposition 65 Information WARNING: These products contain a chemical known to the state of California to cause cancer and birth defects or reproductive harm – https://www.p65warnings.ca.gov/chemicals/lead-and-lead-compounds