Alright, for all you woodworkers and contractors out there with Porter Cable angle nailers that are starting to lose their punch - listen up! This replacement seal (part number 904750) is exactly what you need to get your trusty nailer working like new again. I've got an older DA250B 15-gauge angle finish nailer that's been through hundreds of projects, and it recently started leaking air and losing power. Instead of shelling out for a whole new nailer, I ordered this seal and it completely fixed the problem. The installation was straightforward - just take apart the nailer, replace the old worn-out seal with this new one, and reassemble. The fit was perfect, exactly like the original part. This seal is compatible with several Porter Cable models including the DA250B Type 1, and it works with FC350Z, FM350A, and FR350A nailers too. What impressed me was the quality - it's made from durable materials that can handle the constant pressure and movement inside the nailer. After installing it, my nailer has that solid, powerful drive back, no more air leaks, and it's been working perfectly through several big trim jobs. If you're experiencing loss of power, air leaks, or your nailer just isn't hitting like it used to, there's a good chance this seal replacement will solve your problems. It's way more cost-effective than buying a new tool, and it keeps your reliable old nailer in service for years to come. Definitely a must-have spare part to keep in your toolbox!