Need a better valve.

[OpenRoad]

I have a 135 gallon plexi tank with plumbed 3/4 inch piping directly from Weir overflow (bottom of tank drilled) into a sump.
I currently have a Spears gate valve inline, however when I need to do maintenance or other work, this valve allows a small trickle of water to pass even when fully tightened.
I am thinking of placing a secondary shutoff but am not keen on using the same valve.

Any suggestions?

 

[blaxsun]

I would imagine that any of the gate valves offered on BRS would probably work for you.