Replacing black tank knife valve Holiday Rambler Vacationer

Once you determine which brand it is and have the replacement in hand, the job is pretty easy. Messy but easy. Remove the belly cover to expose the valves. Remove the 4 acrews and nuts. Place a bucket under the valve. Gently pull things apart. Lift out the blade and gaskets. Liberally grease the new parts with plumbers grease. Reinstal in the reverse order. If your careful it should take no more than about an hour.