Thetford Drain Valve Lubricant 24oz. Coats plumbing lines for complete outflow of tank contents. Works in both toilet and sink/shower waste holding tanks. Non-staining. 24 oz. Features of Thetford Drain Valve Lubricant Drain Valve Lubricant - 24 oz. Brand: Thetford Thetford part number: 15843 The Thetford name is your assurance of quality Package Contents: Thetford Drain Valve Lubricant Thetford 15843: Drain Valve Lubricant 24oz