Our tank fills are inside. Two 400 liter
tanks. My Jim made up a hosetail, which he calls a "pigtail" with an appropriately sized seacock for a positive on and off, and paying attention, there have been a few ooopses, but usually is painless. We've had the
boat 18 yrs., and it has never driven us to the labor of installing
deck fills, which we would have done if this were troublesome enough.
Our fills are just under the settee. Open the drop locker, and there they are. They all are vented inside the
boat, none has ever overflowed. At 40 psi, town pressure, they take about 20 min. each to fill. Slower at lower pressures. Jim also made a dipstick for the
tanks. It is a 1/4" (6 mm) dowel, glued into a champagne cork. With the tank empty, we filled it in 100 liter steps, and marked the dowel at each increment green for starboard and red for port.
@ Miki, if you have drawings of the boat, you may be able to find the fills on the drawings. When available, owners often give them to you at the time of
purchase. Very handy to have. Otherwise, look into easy places to get into that are near the tanks. If you care about the
water in your tanks staying fresh, ditch the outside system [because of the boat sinking possibility], and cycle new fresh
water through the tanks regularly. Water tanks are commonly found under the
cabin sole, under settees, and sometimes under berths.
Ann