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You can see from the last image the cone filter attaches to the larger adapter required for the 45 DCOE rampipe internal size. It is made in Germany & unlike many balancers will not restrict the airflow when put into the rampipe & therefore give a false reading.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.