Matched context for venting and back-flow

The page lists matched contexts for venting and back-flow.

Share - venting	Share - back-flow	Phrase
4.97%	18.94%	{venting or back-flow} valve
1.40%	27.51%	prevent {venting or back-flow} [perform operation]
2.29%	9.86%	fluid {venting or back-flow}
1.95%	4.08%	air {venting or back-flow}
0.71%	6.12%	gas {venting or back-flow}
0.47%	6.55%	fuel {venting or back-flow}
0.22%	2.52%	not {venting or back-flow}