Description
Prevents door slamming from the HVAC running. Significantly improves air circulation between rooms.Air passes right through the vents keeping everything in better balance when doors are closed.Easy to install, takes about 10 minutes.Material: Plastic; Color: Black; Multiple colors available in our catalog to match your design. Fits together nicely.Size: Hole diameter is 1.57 Inches (40mm). Outer diameter: 2.16 Inches (55mm). Total length 1.46 Inches (37mm).