hi all.this is my 1sy post here at this forum,as i thought this is where i could get the right advice.i use a 6x6x6,grey marine electrical conduit box as my res,see pic
http://members.shaw.ca/rognjud/comp14.jpg.it has developed 3 cracks,2 by the bottom drain plug,and 1 by the pump outlet.these are brass fittings.curiously,the plastic 45degree barb shows no signs of cracks.is this a downfall to this type of container,or did i perhaps have the brass fittings torqued down too much.is this plastic not designed to have the walls of the container under that type of pressure caused by the tightening of the fittings.i epoxied last nite,the 3 cracks on the outside of the res.inside the res,i can see hairline cracks where the cracks are outside the res.is epoxy safe to use inside the res,which will come into contact with the water\antifreeze mix.also should i silicone over the epoxy,after it has dried,of course,both on the inside and outside of the res.thnx for your help