Heavy Automatich Changeover Regulatorbrand: Cavagna Group Kosanpart Number: 528bapplication: Automatically Changes Over From Empty Tank To Full Tankmax Input: 253.8 Psioutput: 11.24" Wcinput Size: 1/4" Sae Inverted Flareoutput Size: 1/2" Female Nptcapacity: 450,000 Btu