Low pressure gas connection – 1/2 PSI;High pressure gas connection – 2 PSI;Stainless steel surface mount enclosure;CSA / CGA / AGA approved for indoor and outdoor use;3/8″ – 60,000 BTU Natural Gas at 0.6 SP. at 7″ w.c. / 90,000 BTU Propane at 1.53 SP. at 11″ w.c.;1/2″ – 125,000 BTU Natural Gas at 0.6 SP. at 7″ w.c. / 187,000 BTU Propane at 1.53 SP. at 11″ w.c.;3/8″ or 1/2″ NPT rear or bottom inlet connection included;3/8″ or 1/2″ Quick disconnect plug included;Dimensions-3/8″ – 7″ x 5 1/4” x 2 3/8“,1/2″ – 8 1/2″ x 5 1/4″ x 3 1/4″;Temperature Rating: Approved to – 40 Degree C;Complete with Adjustable Standoffs (3/4” – 1 1/2“) for siding or stone surface applications