Many RV owners, especially those who are new to the lifestyle, will run into some sort of a holding tank issue, whether it be a pyramid plug, a compacted tank, or a blocked line. Of all of these types of clogs, however, a blocked line can be the most deceptive. A blocked RV toilet line is relatively uncommon, but it can be difficult to diagnose as it is often mistaken for a pyramid plug. Luckily, a blocked toilet line is normally much easier to fix than a pyramid plug, and it’s much less serious!