4" Round No screen vent - tab style, mill - bag of 4 Open screen w 1/8 mesh These round aluminum vents have

These round aluminum vents have a strong 1/8" screen to keep insects out

RBLS-104 6"2PK

RBS-100 4" 4PK

glass or PVC pipe

4" Round No screen vent - tab style, mill - bag of 4 Open screen w 1/8 mesh These round aluminum vents have4" Round Mill No Screen Vent, tab style bag of 4 RLT 200 4"4PK These round aluminum vents have closely spaced louvers to keep insects out. They do not have a screen. They are easy to install into a 4" hole made by a drill type hole saw. They are held in place by 6 tabs on the side of the vent. No nails or screws are needed. Note: These are made for thin materials like metal, glass or plastic. They do not work well in wood. The tabs need to be bent