About: http://webisa.webdatacommons.org/337050905

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	Preferably, the outer pipes 80 and the cylindrical caps 88, 90 are made of a generally rigid material, such as PVC, although other similar materials of construction are possible.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es