Spectre’s 3 inch outside diameter universal vent port and vacuum sensor adapter is manufactured from durable co-polymer ABS resin that can help insulate the intake tract from heat. Universal design includes 3 vacuum/vent fittings and port openings for multiple configurations. The grommets/holes in the tube come pre-plugged so you only use the ports you need. Combine with other 3 inch tubing to create an intake for almost any application.