Thankyou. So in terms of BSS. im not using gas, theres no gas appliances on the boat, the two fitter points on the gas pipes the previous owner installed have been capped, will it go through like this or do I need to do something else?
On the hole, good spot, not sure will need another look. It does look a bit like a hole with foam filler in it, or it could be spider eggs ( lots of yellow clumps in the gas locker). Will I have to get it welded if its a hole?