Solvent weld. Designed for internal use. Aquaflow's 110 mm air admittance valve is necessary for the prevention of waste liquid expulsion and the build-up of bad odours. When a toilet is flushed or you draw water from a sink, pressure is built up that needs to be released - an admittance valve does this. Designed for indoor use, this air admittance valve will draw fresh air in from the outside while preventing foul air from the plumbing system from being released into domestic spaces. You'll fin

Brand Name	Aquaflow