Dear, I have the same question as I am thinking of doing or not installing that top up “valve” (but actually it is not a valve, it is just an air tap) to the raft being DIYed at the moment. However, thinking it as similar material to the Boston valve’s base, I will install it in the way as similar to that for a Boston valve installation as described in the video. But would you please help ? I don’t have experience on top up of an air chamber, does it really necessary ? For, I have been paddleing with a PVC air canoe which has an safety valve for any air expension due to sun shining. Thanks so much! Cheers mate. * O! Forget it, just saw Matt’s new post, it solves all my questions, great man.
