The Zeppelin (1991 350) has what appears to be a fitting for a water filter under the galley sink, but has no filter in it. It is metal, blue, round, fluted, and screws on and off. It is in the main water supply line to the sink faucet, not the heater for coffee-tea. (No photo before the weekend!)
Does anyone:
1. Have a similar fitting?
2. Know what filter is was made for (if any)?
3. Know a source for the filters?
Lousy water in the campground last week!!
Best,
R