About: backflow preventer

Premodifier: backflow
Head noun: preventer

Same concepts
http://dbpedia.org/resource/Backflow_prevention_device

Broader concepts

label	provenance	confidence
one-way valve	isap:12428215	0.818614
water quality product	isap:28654993	0.793210
device	isap:135463505	0.533812

Narrower concepts

label	provenance	confidence
air gap	isap:264012704	0.579150
check valve	isap:337991254	0.471576