Is your nail gun losing power or jamming a lot?

Chances are the piston bumper and seal are worn out.

This kit includes the 878-179 O-ring and 877-993 washer, which are direct replacements for a bunch of popular pneumatic nailers and staplers.

It fits models like the NV45AB2, NH451, NV45AB2(S), NT50A, NV45AE, NV45AA, NV50A1, and NV45AB.

Basically, if you've got one of these Hitachi or compatible nail guns, this kit is what you need to get it firing like new again.

The O-ring is made from oil-resistant, heat-resistant rubber, and the washer is treated to resist rust.

So they last a long time even with heavy daily use.

The dimensions match OEM specs exactly, which means no modification needed—just pop them in and you're back to work.

This kit solves common issues like air leaks, weak nailing, misfires, and jamming.

It's a way cheaper alternative than buying a whole new nail gun, and it's easy enough for a DIY repair.

If you run a repair shop or just do a lot of woodworking, it's a smart spare to have on hand.

Overall, it's a reliable, cost-effective fix that'll keep your nail gun running smooth.