Posted By: Ductape on 10/19/14 02:05pm
The pressure won't escape from the toilet because the toilet has a valve in it. Unlike a home toilet, it is not going to back up.
Sorry, but a black tank under pressure from a pressurized water source, WILL force water pass the toilet flush seal...just as it will force water up the vent line. Which ever is lower, will leak first.
I have seen this happen with two DPs and a large Class C.
And, if this happens to you, DO NOT try to flush the toilet...you MUST release the pressure in the black tank first by turning off the water and pulling the black tank drain valve. If you try to flush the toilet, be prepared for a shower of not so nice water.
Ron
