Thetford RV Drain Valve Lubricant 15843, 24 oz. Bottle
A water soluble additive that lubricates holding tank systems and drain valves. Coats plumbing lines for complete outflow of tank contents. Works in both toilet and sink/shower waste holding tanks. Non-staining. Thetford is a name you can trust and a company you can count on, a world market leader in carefree camping for more than 50 years.