no need for the overflow.. the hole in the side of the tank should take care of that for you..and if the cap is vented it will be self starting...
also the pipe in the tank does not need to go down any more than the elbow itself unless you want to draw from the bottom of the tank..
umm.. anyway.. the Y.. i think ive seen them but i could be wrong.. with a dremel and some silicone you can make whatever frankenstein fitting you want.. soon as i get some time i need to make a double dorso (2 3/4" 90s joined to a 1" straight.. but it has to fit in a 4" box... )
also the pipe in the tank does not need to go down any more than the elbow itself unless you want to draw from the bottom of the tank..
umm.. anyway.. the Y.. i think ive seen them but i could be wrong.. with a dremel and some silicone you can make whatever frankenstein fitting you want.. soon as i get some time i need to make a double dorso (2 3/4" 90s joined to a 1" straight.. but it has to fit in a 4" box... )
