A three inch hole saw and a Tanksaver kit from sealand costing about $20 is required.
Find a flat surface on your holding tank top surface and drill the 3 inch hole. Push in the rubber ring and then coat the valve insert with dish washing liquid and push in. That's all there is to it. Just a ten minute job on each tank.
Hole drilled and rubber insert placed
Monday, April 4, 2011
What happens if your holding tank vent gets clogged? It could be a bug building a nest in the vent fitting out on the stern. Or it could be "stuff" pushed up into the vent by overfilling the tank (oh, there's enough room for one more flush, isn't there?). Whatever the cause, having the vent line blocked is a problem. If it is almost blocked, then you will probably be unaware of it during normal head usage, because the rate of inflow is small. Ah, but during pump out, when the flow rate is much, much higher, problems can occur. How to protect your boat from this event? Paul on s/v Solace has this helpful tip for us: