Below is what I got from Jayco website for 2016 model. I'm assuming that the capacity is the same for 2015.
Weights & Measures
Tank CapacitiesFresh Water Capacity (gals)75
Gray Waste Water Capacity (gals)103
Black Waste Water Capacity (gals)37
Originally Posted by tadam
Does anyone know where I can find what each grey tank capacity is in our '15 Pinnacle 38FLSA (we have 3)? It only tells me the total capacity in the manual.