About: http://webisa.webdatacommons.org/137776377

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	The sealing member 532 may be made of polytetrafluoroethylene or other suitable material that provides a relatively low friction surface facing the base portion 504 a of the housing 504.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com