About: http://webisa.webdatacommons.org/235207845

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	At a point below the juncture of the two portions is a vent means consisting simply of an aperture or bore into the filter-head portion above the normal liquid level therein.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk