Click for larger view

I added a flexible holding tank in the port side swim deck locker. T-ed into the overboard discharge and has its own shutoff valve. This is a 25 gallon tank that doubles my holding capacity. Has separate pumpout and no vent. When full I plan on leaving the pumpout cap slightly loose; if this doesnt work out Ill plumb the vent (short vertical hose near the center back in the picture. I tested with clean water by filling the pumpout. It gravity drains about 80%. Using the pumpout flattens it like a pancake. I plan on using the macerator pump to transfer waste once the gage says it is nearly full, then shut off the flex tanks valve. Ill post a more detailed install on the Hunter Facebook group page.