IM OUTTA HERE Compatible with 850607 Bostitch RN46-1/N55C Coil-Fed Nailer Replacement O-Rings for Bostitch RN46, RN45B, N55C, N58C & 438S2 – 4 pack. This part is compatible with following Bostitch model numbers: 438S2 Pneumatic Stapler| 438S2R Pneumatic Stapler| 438S4 Pneumatic Stapler| 438S5 Pneumatic Stapler| 450S2 Pneumatic Stapler| WM45B Pneumatic Coil Nailer| T55S5 Pneumatic Stapler| N57C Coil-Fed Pneumatic Nailer| N12B Coil-Fed Pneumatic Nailer| RN46 Coil-Fed Pneumatic Roofing Nailer| RN45B Coil-Fed Pneumatic Roofing Nailer| RN46-1 Coil-Fed Pneumatic Roofing Nailer| N55C Coil-Fed Nailer| 438S2R-1 (Type 0) Pneumatic Stapler| 438S2-1 (Type 0) 16 Gauge Wide Crown Stapler| 450S2-1 (Type 0) 16 GA Wide Crown Lathing Stapler| N55CD (Type 0) Coil-Fed Nailer| N58C (Type 0) Coil-Fed Nailer|