I'm planning to install a new holding tank system in my 1959 Pearson
Triton Yawl. According to Peggy Hall in "Get Rid Of Boat Odors" it is
recommended that the vent in a holding tank be 1". But the standard
for 20 gallon tanks seems to be 5/8". It is better to cut a new 1"
vent outlet or live with the exisiting 5/8" vent?

Thanks,

Hal Landen