Gate valves (aka knife valves) are the unsung heroes of your RV black tank—until they decide to betray you. If your handle is sticking, your tank is draining at a snail’s pace, or you’re getting a “stinky surprise” when you remove the cap, don’t panic. This guide breaks down the most common black tank gate valve problems, how to spot what’s really going on, and the simple fixes that can save your next trip (and your nose).

RV holding tank care is crucial! Sanitize freshwater tanks, use RV-safe products in gray & black tanks and flush regularly.