Wasps, mud daubers, birds, and rodents pose a serious threat to the plumbing system on your RV. They can enter through the plumbing vents and cause serious damage by building nests that interfere with air flow. The Camco 42152 Plumbing Screen fits four-prong roof plumbing vents. This easy-to-install screen will help ensure that your vent stays free from costly invasion by unwanted pests.• Screen measures 2.5" dia.• Protects plumbing vent from flying insects, birds, and rodents• Fits four-prong RV roof plumbing vents• Easy to install• Heavy-duty stainless steel mesh cover Fits four-prong RV roof plumbing vents Heavy-duty stainless steel mesh | Camco RV Plumbing Vent Screen