Fernco Introduces AAV Kits That Take the Guesswork Out of Under-Sink Venting

Getting an air admittance valve to the proper height often means measuring, cutting and assembling a separate riser. Fernco’s new AAV Kits simplify the job by bringing the valve, drain connector and stainless steel clamps together in one convenient package.

Available in two configurations for common residential drain layouts, the kits give plumbing professionals and homeowners a straightforward way to add under-sink venting using common tools.

01A built-in height advantage

The International Plumbing Code requires individual and branch-type AAVs to be installed at least 4 inches above the horizontal branch drain or fixture drain being vented. Fernco’s AAV Kits put that consideration into the design. Both the AAVKIT-1 Inline AAV Kit and the AAVKIT-2 90° Bottom Outlet AAV Kit position the valve 4 inches above the horizontal drain they vent, without the need to assemble a separate riser.

Fernco AAVKIT-1 Inline AAV Kit on a horizontal drain, with a 4-inch dimension from the top of the drain to the top of the tee

That means fewer pieces to select and assemble, along with a simpler way to address an important installation requirement. As always, installers should follow the product instructions and applicable local plumbing codes.

02Measure. Cut. Connect.

Both kits are designed for 1½-inch tubular drain connections. Measure and cut the tubing, fit the tee and tighten the stainless steel clamps using a flathead screwdriver or 5/16-inch nut driver. With no solvent cement or curing time, the connection can be checked for leaks as soon as installation is complete.

For plumbers, that means a streamlined setup during a service call or remodel. For homeowners, it means a more approachable installation with fewer separate parts to gather.

03Made to hold up under the sink

An air admittance valve sits out of sight, so it has to work every time the sink drains. The valve in each kit is designed to meet ASSE 1051, the standard the International Plumbing Code calls for in individual and branch-type AAVs, as well as NSF/ANSI 24 and EN 12380.

The connector is flexible elastomeric PVC, the material Fernco couplings are known for, with the gasket material tested to ASTM D5926. Its 300 series stainless steel clamps hold it tight, and the kit is rated from −4°F to 140°F.

Behind every kit is a company that’s been connecting pipe for more than 60 years, with a customer service team that answers within one business day.

04Two configurations for common layouts

Fernco AAVKIT-1 Inline AAV Kit on a trap arm for a wall drain, and AAVKIT-2 90° Bottom Outlet AAV Kit on a drain that goes down through the floor — AAVKIT-1 for a drain in the wall; AAVKIT-2 for a drain through the floor.

AAVKIT-1 Inline AAV Kit: Installs in the horizontal drain tubing after the P-trap, making it suited to sinks with a drain connection in the wall.
AAVKIT-2 90° Bottom Outlet AAV Kit: Connects the trap arm at the side and directs drainage out the bottom for layouts with a drain connection through the floor, including kitchen islands, vanities and laundry sinks.

During drainage, the AAV admits air to help protect the water seal in the P-trap, then closes to help keep sewer gas odors out of the living space. Both kits are rated for residential branch applications up to 8 drainage fixture units (DFU), where permitted by code.

Explore the new Fernco AAV Kits and find the right fit for your sink, or keep both on hand for your next job.

Always follow the installation instructions and local plumbing requirements. The valve must be installed within 15° of vertical, remain accessible and have adequate airflow.