Colin M Haddon Township , NJ August 24, 2015 Appliance: Model ROBER 1353W3A 30" GAS RANGE Worn out broken gas valve knobs Knob No Longer Available. This part has been discontinued and is no longer available. But the page for the part on appliancepartspros.com had the following: NOTE 307231 can be used as a replacement. by Whirlpool Part Number AP3103971 Ordered the suggested replacement parts, they worked perfectly. Read More... Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes