Changed mine when I did the KDP at 100K. Was VERY easy with all the rest of the stuff out of the way - fan, hoses, etc. Paid about the same at NAPA. BTW, there really isn't a gasket, just a rubber seal. Before I put it on I smeared a little "Magic Lube" on the seal. It's a teflon based waterproof lube I use mainly to seal O-rings on the swimming pool pumps. Any thoughts about this, Illflem? Got it at Pinch-A-Penny for about 5 bucks. I don't know how well it tolerates heat but I always have some around and it seemed like an OK idea at the time. No leaks since. Not to say it would have dripped without it, of course. Oo.