Patent ID: 7240378
Filing Date: 2007-07-10
Classification: A01M,E03D,E03F,F16K,Y10T

Abstract:
1. A flange valve to deter entry of rodents and pests, insertable on existing devices, comprising a unidirectional, spring biased, swinging door attached on an inner wall of a cylindrical body having an inner central circular opening and a bottom lip, the door and the inner wall having a clearance between them of a dimension not allowing entry of rodents and pests, wherein said door includes a centrally located hole dimensioned to allow for the draining of a small amount of water or waste, and wherein the cylindrical body has a laterally protruding ring on a peripheral edge thereof, having openings on the protruding ring for the introduction of bolts or screws, wherein the door having a bottom surface that is recessed inwardly from the bottom lip of the cylindrical body to prevent pests from hooking or grabbing the door.