Tulsa Oil Thieves are made in three models and in five sizes. The Model A is equipped with an aluminum barrel. The Model B is equipped with a brass barrel. These two models of thieves are of riveted construction. The Model C is equipped with a clear barrel and has tie rod construction to hold the barrel. This model has a replaceable barrel (see P4982). All Tulsa Oil Thieves have the following features: single trip (original with the Tulsa Thief), antifouling flat bail assembly, full opening horizontal closure system with rotating valve, two adjustable springs (one for closing tension, and one for tripping tension, for more flexible adjustment), side hanger on top casting for hanging thief on hatch or equipment case, adjustable graduated trip rod (trip rod makes fourth leg for holding thief in upright position as a hydrometer cylinder). Petcocks may be installed at any point on any style oil thief, except near top or base castings.