All Delta Heat grills and side-burners are required to use a regulator. ; This regulator is convertible to LP liquid propane for bulk/all-house propane setups, additional see images. However, this regulator should not be used as a direct replacement to the S15344 Regulator for LP and that one should be purchased for 5gallon/20lb tanks setups. Any questions about this please contact our service department: email@example.com or 562-263-3600. The input into this regulator is 1/2".