Cash Acme 22398-0000LF Vr-801 Drill Vent 3/4-Inch Vacuum Relief Valve with Dust Cover, Lead Free Maximum water pressure 200 psi Maximum temperature 210 Degree (99 Degree) Capacity 13 SCFM at 2" Hg. Available with dust cover The VR-801 is design certified to ANSI Z21.22/CSA 4.4