Drain valve lubricant - 591ml (20 oz)
Thetford
* Prevents sticky valves, restoring easy operation
* Coats plumbing lines for complete outflow of tank contents
* Approximately 148 ml in each holding tank effectively lubricates drain valves, lines & walls
* Works in both toilet and sink/shower waste holding tanks
* Non-staining
* Case quantity is 12 bottles