STUDOR | sku: 301051 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... Log in for pricing