Ken.....those aquarium 4 gang manifolds with individual taper plug valves on each of the discharge lines are cheap as chips.
.......
From memory about $6.50 AUD including air parcel post deliver from China
They are advertised as stainless steel
[God bless their cotton socks] but are actually brass material which is flash copper coated & then flash nickel plated....or perfect for marine ...or water usage.......
Here is my application of a different concept
being two water pump suctions, one bypass loop & one drain & all tubed up with 1/8" & 5/32 " brass tube for my steam build....
I have carefully grit blasted my manifold to remove the nickel plating for a more life like surface for steam components ......Derek