Prevent sticky holding tank drain valves and extend your RV plumbing system’s lifespan with this specialized lubricant from Thetford. The 24-ounce bottle uses a biodegradable formula that lubricates internal drain valve components, prevents seal wear from friction, and coats plumbing lines for smooth tank evacuation. Works safely in both grey and black water tanks, providing preventative maintenance that keeps your holding tank system operating smoothly.

• Lubricates holding tank drain valves
• Prevents seal wear and sticky operation
• Restores easy valve operation
• Coats plumbing lines for smooth evacuation
• Safe for grey and black water tanks
• 100% biodegradable formula
• 24 oz bottle