I am converting the 3 tanks over to stainless steel parts and stainless steel hardware, this is the hardest part of the whole job. Priced out all the manifolds and when I need to I sacrifice the cheapest one. Have 90% of the bolts out from the one tank so far. I am using an air hammer with a point and once u get them to move the go easy, but to get them to move. Replacing with 1/4 inch by 8 inch 316 stainless carriage bolt.