20340 IPS Studor Mini VentThe unique design of the STUDOR MINI-VENT provides plumbing ventilation to prevent the loss of water seals in traps without the need for costly roof penetration and vent piping.Can be used as an individual, branch, circuit or stack ventFits 1 1/2" and 2" pipe sizesWill vent up to 160 DFUs on a branchWill vent up to 24 DFUs on stackExpands architectural design limitsReduces the number of fire-stopping applicationsExclusive vermin protection systemLimited lifetime warranty for replacement of defective valvesResidential or Commercial UseANSI/ASSE 1051, ANSI/ASSE 1050, NSF 14, Warnock Hersey