Originally Posted by boating2go
I have two Jabsco toilets that a few weeks ago I put new joker valves in and cleaned everything to make sure everything worked well. The one in the main head
is again filling with water and has low pressure when flushing
. Anyone have any suggestions?
a. What model?
b. Clean water or waste backflow?
c. Do they share a waste tank?
If it is clean water it is unrelated to the joker valve. Depending on the model, as a poster said, there is a defective valve. It could also be a bit of dirt in the intake valve, which is easily removed (but a little tricky to re-assymble--look at the diagram). An inlet filter helps.
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If it is wastewater, it could be 3 general things:
1. More flushing is needed. There should be no waste in the hose. 2. Joker valves can backflow slowly if anything gets in the seal. This isn't necessarily a real defect, but just the character of marine
2. Waste line is too long.
3. Back pressure due to a bad vent. Do they share a waste tank?
If it is a Jabsco manual head and is more than 5 years old, the best cure is to replace the pump assembly. For not much more than the price
of a rebuild
kit you get effectively a new head and installation
is dead easy, often easier than swapping the joker valve.