Vollrath, Somerville Gravy Urn Food Pan, 4635430-1 Keep an extra inset on hand for your Vollrath 4635410 4 qt. Somerville gravy / sauce urn with this 4635430-1 stainless steel inset! It's made of beautiful, mirror-finished stainless steel for easy clean up and years of consistent, high volume use at your restaurant, buffet, or catered events.