Vented Plug for 3" PVC

thingiverse

I Need a Vented Plug to Fit 3" PVC Pipe for My Furnace Exhaust System. Initially, I Tried Out the First Version of the Plug, But It Was a Bit Loose and Ended Up Making a Nice Coaster Instead. To Get Better Results, I Created a Second Version with a Tighter Fit Inside the PVC Pipe. Now, My Furnace's Air Intake Will Be Protected from Any Unwanted Critters Trying to Sneak In.