Rebecca R Byhalia , MS August 18, 2018 Appliance: Whirlpool 30" Slide-In Gas Oven Non-Conv GW395LEPB00 Whirlpool Range Gw395lepb00: We were changing from lp to natural gas & needed the orifices for natural gas for our stove. How to replace Burner Base With Orifice (Small). After having a live chat with one of your agents, I was given the part numbers needed to make the change to natural gas. Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours