This is a Genuine OEM DeWalt Part.  

This is Part #9R209578 End Cap.  This assembly is compatible with several models including:  SEE BELOW FOR MODELS.  Please make absolutely sure this part fits your model before purchasing. 

Bostitch

N75C Coil-Fed Pneumatic Sheathing Nailer

N66C Coil-Fed Pneumatic Nailer

N66BC Cap Nailer

N66BC-1 (Type 0) Cap Nailer

N75C-1 Type 0 Coil Sheathing/Siding Nailer

N66C-1 (72400000) 15 Degrees Coil Siding Nailer

N66C-1 (072400000 and Higher) Nailer Power Tool

N66C-1 (17300 000 and Higher) Nailer Power Tool

DeWALT

DW66C-1 (Type 0) 15 Deg Coi Side Nail

DW66C-1 (17300 000 and Higher) 15 Deg Coi Side Nail Power Tool

SPECIAL NOTE:  Our new DeWalt parts are all genuine OEM made for DeWalt service.  None of these are third party, off-brand parts.  We will warrant these parts as new and working upon arrival, however, we will not warrant if you bought the wrong part or damage it during installation, so be careful when ordering and in your self-service.