We got a leak coming from the front of the cooler
You can’t see the leak but it seeps right at the base of the silver washer.
The inside looks good
Im very open to suggestions …a leak isn’t fun on a brew day!
I have a similarly built one and I used o-rings internally to help seal/seat the pipe that goes through the cooler wall. It’s actually got four o-rings internally (actually inside the wall, around the pipe), then the seal that came with the cooler on the inside wall, and another o-ring sealing where the external washer hits the outer wall. It doesn’t even seat all that tightly, but it seals fine. Might be worth a shot. Otherwise I’d suggest going to the hardware store and figuring out how to make a better seal than what you’ve got.
I had a leak in the front I couldn’t get rid of when I initially built my mash tun. Ended up buying a pack of hose o rings at home depot and sliding a few extra ones on and that solved the problem.
Also, sometimes less pressure is better. Only tighten until everything is just snug. Too much pressure could warp one of the o rings and lead to a leak.
I tried several combinations of o-rings and washers with no luck. I bought food safe aquarium silicone and that has sealed it up. Apply to the inside of the tun.
+1…quite important not to over tighten.
I use this Water Weld by JB Weld. It’s done great for me.
Dave
Had the same problem with a cooler I recently fitted up. The orange o-ring washers wouldn’t seal. Went to the big box store and found a 1/16" thick neoprene fender washer 1-1/2" in diameter. Enlarged the hole to accommodate the nipple, placed one on the inside and one on the outside and it sealed like a charm.