Ok, I'm not familar with the NS model regulator. We have ran Impco brand carburetors and regulators for years on irrigation engines on natural gas or propane and they have always been good on service unlike the Ensign when Bosch split up and sold things out. Impco has also bought several other LP companies out over the years. http://www.impco.ws/ Ensign parts are getting hard to find and we don't even mess with that brand now. You might ask this place too and we get our LP stuff from them or local dealers here.