2012 Viewfinder RV Black Tank Leak Diagram & Repair Help

An exact factory-sealed-hole location and leak diagnosis have not been verified for the tank marked 4339-2 in your 2012 Viewfinder. The RV year/model and a similar tank outline do not establish the installed tank's revision or identify a leaking manufacturing closure.

The current 4339/H1259 catalog listing retains an Elkhart Plastics drawing marked 4339, revision 1, dated November 9, 2012. It is a comparison reference, not a confirmed cross-reference to the question's 4339-2 designation. The viewed print does not label the small round mark as a factory-sealed manufacturing hole or identify it as a leak source. A 29-gallon or 30-gallon listing should not be treated as the same tank simply because its footprint looks similar.

Provide a clear photo of all molded/stamped tank numbers, the entire tank and connection layout, and the suspected leaking area. Request the exact tank/revision drawing through the RV builder or tank manufacturer using those identifiers. An RV plumbing professional should confirm the leak on the actual installation before deciding on repair or replacement. Do not drill, plug or weld an assumed location from a different tank's diagram. No specific sealed-hole purpose, replacement fit or repair method is certified by this answer.