Valterra Bug Screen For RV Plumbing Vent Fits 4 Prong Roof Vents. They are easy to install and offer minimal airflow restriction while ensuring that your vents stay free from costly invasion by unwanted pests (nesting insects birds and rodents). Screens should be inspected monthly and cleaned when necessary to maintain proper air flow. Screen measures 2.47" in diameter. Features of Valterra A10-1340VP Bug Screen For RV Plumbing Vent Fits 4 Prong Roof Vents Fits four-prong type RV roof plumbing vents Ensures that your vents stay free from costly invasion by unwanted pests (nesting insects birds and rodents) Heavy duty stainless steel mesh cover Minimal airflow restriction Includes installation tool and two spring fasteners Package Contents: Valterra A10-1340VP Bug Screen For RV Plumbing Vent Fits 4 Prong Roof Vents Valterra A10-1340VP: Bug Screen For RV Plumbing Vent Fits 4 Prong Roof Vents