Hull Pressure vent

Fiberglas hulls often have pressure relief holes to equalize pressure as heating and cooling cause pressure differences
Did not find them when I pressure tested my hulls
Have issue with the access port covers under the seat covers but otherwise pretty good shape for the abuse they receive in our sailing school
Staff will need to be retrained as they forced the plugs in with sand and caused damage My oldest hulls were in best shape and no leaks at the plugs

Our local municipal park bought 3 Bravos a couple or three years back. I noted that in the summer the pressure build up inside the hull was immense. Rather than risk any damage, I used a tiny drill bit, probably 1/16th diameter, if even that, to put a small hole in the hull at the forward area just behind the mast. The hulls don't take on water and the pressure inside the hull can stay equal with that outside.

good call I use a 3/16 hole normally does not get clogged