RB wrote:


Our pontoons have some drilled holes in the tops, along the centerline
(maybe 3 or 4 holes). I have no idea why they're there.

1. Are the pontoons normally sealed capsule type things?

2. Are pontoons normally vented for air expansion/contraction?

3. Can I simply put patches over all the holes, or do I need to rig a vent
pipe on each pontoon?


I've noticed that as well. the pontoons I've looked at all ahve a small
spring loaded, vent like device on the top of the tubes. I would
imagine that is for expansion/contraction, in temperature change due to
weather or water temp. probably to help reduce stress cracks from
forming.