Noritz RC4 Rain cap vertical vent termination for 4" Stainless Steel vent pipe
Termination Cap Mesh Screen Vent Cover, Furnace & Roof Vent Cap, Stainless Steel Wire Round Exhaust Pipe Cover End for Kitchen and Bathroom(100mm) - Amazon.com
Simpson Dura-Vent 46DVA-HC Duravent Horizontal Square Termination Cap-4" x 6 5/8" Direct Vent, 4" x 6.625", Galvanized - Duravent Termination Cap And Thimble - Amazon.com