kitchen sink drain is slow

[jimcol]

Gene, I haven't had to work on the 5'ers plumbing but do a little residential plumbing. I am not a big believer in any of the solutions you pour down the drains to clear a clog. If it doesn't clear the clog you have the same mess to deal with only now it has harsh chemicals in it to eat your hands and eveything else it comes in contact with. I would also be concerned what drain cleaners will do to the seals on the holding tank dump valve. I would check to insure the vent on that sink is not stopped up. If it is clean I would remeve the p-trap under the sink. If it is plugged beyound the trap you'll have to use a snake type auger to break the clog. Good luck and let us know what you find out.