Superior Parts SP 878-539 Aftermarket Exhaust Valve for Hitachi N5010A / NT65A / NT65A2 / N5010A / N5008AC / N5008AC2 / N5008ACP Replaces Hitachi 878-539. Details Compatible with: Hitachi N5008ACP 7/16" 1" - 2" x 16 Gauge Standard Crown Stapler N5010A 1/2" Standard Crown Stapler N5008AC 2" 16Ga 1"-2"Standard Crown Construction Stapler NT65A 16 Gage Brad Nailer NT65A2 2-1/2" 16Ga Finish Nailer N5008AC2 Stapler More Information Model# SP 878-539 UPC 099461764255 WARNING California Proposition 65 Brand Superior Parts