3171 Lower Sleeve (Package of 5 Pieces) Fits: APT-133, 1133, 633. CP-4181, CP-4608, CP-4611 Atsco-RB08, RB11, Kent A90, Toku-RB91, RB-110, RB-110D IR-9001, 8000, TX-133RB, TX-1133RB, Sullair-MRB-08, MRB-11, Kent-K800, K1100.