💨 Breathe Easy with Maxi-Vent! Compatible with 3- or 4-inch piping for easy installation. Meets ANSI/ASSE standards for peace of mind. Gravity seal automatically closes to block unpleasant odors. Exclusive design keeps bugs and debris at bay. Maxi-Vent ensures optimal air flow while keeping your space fresh. 160 DFUs capacity Temperature range -40°F to 150°F Push-fit rubber connector The Studor 20342 Maxi-Vent Air Admittance Valve is a high-performance solution designed to enhance ventilation in drainage systems. With a capacity of up to 160 DFUs on a branch and 500 DFUs on a stack, it effectively prevents foul odors and maintains water seals. Its push-fit rubber connector ensures a hassle-free installation, while the vermin protection system safeguards against unwanted pests. This valve is compliant with ANSI/ASSE standards and operates efficiently within a temperature range of -40°F to 150°F.