STUDOR Maxi-Vent Air Admittance Valve (6/Case)

The unique design of the Studor Maxi-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 vent. Will vent up to 500 DFUs on a stack. Residential or commercial use.|Limited lifetime warranty|Will vent up to 500 DFUs on a stack|Reduces the number of fire-stopping applications|Exclusive vermin protection system|WARNING - This product contains chemicals known to the state of California to cause cancer and reproduction harm.|Residential or commercial use