Up to now, underground hydrants have mainly been coated with 2 coating systems, inside enamelled and outside epoxy. The seams of the two coating systems and the resulting defects were unavoidable. The new VAG standard is a complete epoxy powder coating (EPP). It eliminates seams between 2 coating systems and thus provides even better protection against corrosion. For standpost hydrants, the upper column outside is provided with an additional UV protection made of red-coloured polyester material on the outside.