The 2” Express Off-Ramp comes with an adapter for split tube, the cover for the 2” Express Off-Ramp is 027-2000-4263. The split tube adapter component does not require its own additional cover.
The 4” Express Off-Ramp dual split tube piece is 027-2000-4016, the cover for it is 027-2000-4018. The cover for the 4” Express Off-Ramp is 027-1000-4066.