RO/DI auto shut off - HELP!!!!!

[lemon drop]

I have been working on getting my RO/DI unit out of my kitchen this weekend. It has been in there for about 10 months and is driving me mad!!!!!
Anyway, I have moved the set up to the laundry room. Put a Y valve on the washing maching water line. Run a hose through the wall and to the auto shut off, then to the filter unit and back into a garbage can (clean 55 gallon only used for fish water). The discharged water runs back through the wall and down the drain for the washing machine.
I have bought all the appropriate connectors and auto shut off I have is a brass one with and intake and outlet with fittings for hoses. Then there is a float attached by an arm and a simple shaft in the unit to shut it off. However, it is leaking non filtered water out the top of the shaft. I have taken the unit apart many times and added two new, thicker gasket/o-rings. It slowed the leaking down, but unless the unit is just right it still leaks.
My questions are:
what auto shut offs are other people using?
where you purchased them?
do you hook the auto shut off before or after the filter unit? If it is after, don't you have water constantly discharging from your unit?
and any other suggestions you may have?
ideas on how to connect the shut off valve to the garbage can? (I was thinking the unit should attach inside the can incase it leaks)

 

[lemon drop]

A few people posted, on a different message board, about commercially available shut offs. Does anyone have any suggestions for home made ones?

 

[tree]

Originally Posted by Lemon Drop
My questions are:
what auto shut offs are other people using?
where you purchased them?
do you hook the auto shut off before or after the filter unit? If it is after, don't you have water constantly discharging from your unit?
and any other suggestions you may have?
ideas on how to connect the shut off valve to the garbage can? (I was thinking the unit should attach inside the can incase it leaks)
I used the auto shutoff that came with my RO/Di unit. Can't list the link as that would violate the policy. But the unit is called a Neptune and you could search for it. I'm attaching a picture of the shutoff piece.
the auto shutoff goes after the filtration unit. I don't appear to have discharge water once the shutoff stops the flow from the RO/DI unit.
My unit goes thru the side of the can. We drilled a hole, placed the unit in it the hole, screwed the fitting on, connected the tubing and we were done.
for other suggestions, you said you're unit was brass? You should replace that with a plastic unit as brass contains copper which is bad for reef tanks.