Exhaust Capture Adapter Finally, a REAL solution to flush mount tailpipes!. Crushproof's F675-SC is a patent pending flush mount tailpipe adapter. . It utilizes a suction cup system to securely mount a large oval adapter over flush mount tailpipes. . The adapter attaches to Crushproof hoses FLT300, FLT400, and ACT400. . The adapter has an oval opening that measures 12 wide by 3 high. . It must be used with a fan assisted exhaust system.. Includes: Adapter with Rubber Suction Cup, 3” x 4’ Hose, and AY30 Y-Connector F675-SC