Does a 1969 A30 have any "O" rings on the origional water, waste or Gas fuel filler screw caps. Mine does not and have never had a problem with water intrusion. On another tack I have an Atomic4 with fresh water cooling and was wondering what are the pro's and con's of a higher thermostat eg 160f thermostat. John Boor MAHSEER #380 1168622451.0