SBL, Incomplete, metal, labeled plug from tap, stop closure part soil found bronze brass metal, cast finished bronze stop: solid tapered rod in which round opening is recessed handle (in the form of tripod) broken down two more quarter circles are visible. mark on the basis of the grip: SBL underneath sitting bird D archeology Valckensteyn Poortugaal Albrandswaard tap tap holder component barrel beer wine Soil discovery of the Poortugaal castle Valckensteyn.