Pro-Drive Fasteners® ORK6 O-Ring: Kit Fits: MOST Bostitch® 15ga Flooring staplers and 16ga L CLEAT Tools MIII886, MIII812, MIIIFS, MIIIFN, MFIII, MF-200, BTFP12569. Ideal for pneumatic flooring tool maintenance. The Bostitch® ORK6 O-ring kit makes it quick and easy for just about anyone to rebuild their nailer or Stapler; and it will save you time and money over sending the tool out for service. The ORK6 contains everything you need to get your nailer or Stapler running like new again You'll have your tool up and running again in no time, and it will run just like it did the first day you took it out of the box. Comes with: 86460 - Poppet Piston O-Ring / 850144 - Plunger O-Ring (External) / 86458 - Plunger O-Ring (Internal) / 850143 - Poppet I.D. O-Ring (PU) / 850626 - Piston O-Ring / #180256 (6500) - Cap Gasket (Small) / BC1329 #6500 - Cap Gasket (Big) / 88998 - Piloted Valve O-Ring (Lower) x2