Cups have a spring loaded trigger stem for positive shut-off of water. Water flows only when the birds beak is in the cup. No messy wet spots as with nipple drinkers.
We think these drinker cups are the best thing ever! If you've spent any time cleaning and filling dirty waterers you'll love these.

Screw in style nipples are also a popular choice. The nipples are valves that dispense droplets of water when pecked. The 360 degree stainless steel nipple will work from any angle. Choosing these requires that you mount your manifold inside the pen and a bit higher, as the birds usually peck at these from below.

Pipe Assembly

(cups and nipples are interchangeable)

This configuration is a good choice with drinker cups to supply two pens.

Use this in a corner or to add number of drinkers in a pen.

Reservoir Outlet

(Though the reservoir comes with a handle, we do not recommend hanging)

Ported faucet and adapters
(water thief)

(These attach to your water source and provide a port for the needle valve)

3/4" ported faucet for replacement of old faucet or newly installed pipe.

Ported adapter. Install this between the pipe and faucet of your existing hose bib. Be sure to specify 1/2" or 3/4"

You'll need to know what size of pipe you have. This video should help.