Spill Containment Manholes are currently required by Federal EPA regulation to catch any spillage when filling the UST. Thread-on style spill containers are typically used on new tanks or installed on an existing UST that has been uncovered. Retrofit style manholes may be used to slip over the existing steel fill riser pipe. ANS Distributing carries several models, sizes, and brands of spill containers. Some of the more popular are listed below. If you are interested in other models, please call us.