Burlington Wilbert Vault Works is a leading manufacturer of septic tanks in the Midwest. Tanks sizes available are 600 - 1000 - 1250 and 1500 gallon tanks.We sell wholesale only on burial vaults.Located at 2845 Mt. Pleasant St. Burlington, IA 52601.brCall us. Serving Burlington, West Burlington and Mt. Pleasant Iowa and surrounding areas.Burlington Wilbert Vault Works is the area's largest manufacturer of burial vaults. Serving the area since 1937.