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Mushroom Vent Cap

MSRP: $7.85
(You save $0.72 )
Calculated at Checkout

Product Overview

The mushroom vent cap has molded-in steps to accommodate either 3” or 4” roof vent pipe.  Manufactured and assembled in the USA by Plastic Oddities, “Friend of the Plumber”. Cap locks into position with 3 flat-end bolts, which will not penetrate the pipe, unlike pointed bolts.  Helps prevent rain, leaves, debris, flying insects, and animals such as squirrels from entering vent pipe.  Also works on portable toilet enclosure vent pipes and other exterior pipes that need to be protected. Quality Plastic Oddities parts – since 1975.


Refer to the video below for important installation tips of the “Plumber& DIY Friendly” Plastic Oddities mushroom vent cap.



  • Molded-in steps in cap accommodate either 3” or 4” vent pipe
  • Cap is locked in position with 3 hex head bolts
  • Helps prevent rain, leaves, debris, flying insects, and animals like squirrels from entering vent pipe
  • Works on roof vent pipe as well as portable toilet vent pipe
  • Made in the USA



  • Mounts to 3” or 4" pipe

Product Videos