Thetford Drain Valve Lubricant solves holding tank problems.
Here's an ounce of prevention in a 24-ounce bottle. Our special formula prevents seal wear, sticky drain valves and keeps all the plumbing lines operating smoothly.
Lubricates valve for easy operation. Non-staining, formaldehyde-free and environmentally safe. 2 oz./40 gal. tank. USA.