4" x 7" Restrictor Plate (recommended for aggressive vertical venting) - RP4
4" x 7" Restrictor Plate (recommended for aggressive vertical venting). Reduces the flow of air for increased fuel efficiency.
WARNING: Carcinogens: This product can expose you to chemicals including Lead, which is [are] known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.