Ok so today I ran a little test.. I have 5ea pre-made ready cups and I was curious as to why some are getting leaks and others are not..
I have 2 Divers.. One has been in my tank with the same cup since it arrived and it's leak free!
My 2nd Diver was purchased for use with the Grail (love it by the way) but wanted to test it out in my tank to see if it leaked..
Yup! Leak, leak, leak... And I am not talking a little here, it leaked worse than an old Russian submarine!
Ok.. A little investigation and I find the bottom pin does not fit as snug as it does in my 1st Diver cup that has been leak free.. I assume it's the cup so I grab a pre-made cup and again it feels loose. Load it up and leak, leak, leak...
Crud! 2 cups that are pretty much DOA..
Okie dokie.. Grab a 3rd pre-made cup and on this one the pin sits nice and tight like the cup on my 1st Diver does.. Bingo! Not a single drop!
Now I am curious and test out the rest of my pre-made cups.. One is loose and leaks the other is tight and dose not!
The moral of this story is that all cups are NOT created equal...
Of my 5 pre-made cups only 2 do not leak..
This does irritate me a little as they are not cheap and it's a basic roll of the dice..
My suggestion is that if you have leaks to try a different cup!
Yes.. I had a total of 7 pre-made cups. 1ea that came with my Divers and a 5 pack of ready made.. Of the 7 cups total I have 3 that do not leak..
As a side note for others following this.. With the leaky cups I also tired filling the tank with the air hole outside the tank.. No dice, it still leaked..
I don't know if this is conclusive but I fully believe it's the cups that cause leaking. If the bottom post has a loose fit you are going to leak, end of story.. If it's a tight fit then you are probably good to go..
3 working cups out of 7 is not good odds / numbers but I love the Diver so all is good...
I am 500% positive it's the cups because the cup was the only variable that changed in my experiment... I only tired 7 cups so more testing may be needed..
More testing is definitely needed.. All I can say is that if you have a leaky setup, try a different cup.. What I noticed is that on the ones that do not leak the pin was a very tight fit and I had to use a lot of pressure to get it seated..
The base of the Diver?
I think the Diver is solid.. The cups (manufacturing differences in the cups) appear to be the culprit..
I used the same base, the same Diver and the same pin for all the cups. The only thing that changed between leaking and not leaking was the cups.. More importantly was how tight the pin seated into the bottom of the cup..
Sorry for quoting myself but a bit of an update to my original findings.
My 3rd Diver arrived and the 1st cup I used was a loose fit with the pin and it did leak. Grab another cup and the pin was a tight fit into the cup. I mean real tight! Not a single drop after a full tank..
Also, I do believe that the leaks are also cause during filling. The cup I used that didn't leak was fine through the 1st tank. And that tank was filled with a carto tool. When the tank ran dry I decided to fill up leaving the Diver in place since my SnP tank has the easy filling ports on top. Now the SnP is suppose to allow air to escape out of the 2nd hole while filling, thus not flooding the Diver.
Nope! I filled via the SnP top fill port and leak, leak, leak.... Removed all the juice, then the Diver sit for a few and refilled using the carto tool and the Diver air hole outside of the tank.. BINGO! No leaks, not even a drop!
So my conclusion is:
A) The pin must seat tightly into the ceramic cup. If it does not you will leak.
B) When filling, the Diver air hole should be outside of the tank.
I am NOT putting down the Diver, heck I have 3 of them now. I absolutely love the thing!
Maybe this will help some who are having leaks. When I have a tight fitting pin and I fill with the air hole outside of the tank I get zero leaks, not even a micro of a drop..