Originally Posted by Wet_Boots
Not by design, but I got a few of the 1/2-inch RPZs on a pallet order, mostly to have a lightweight sample to carry around when we were having to explain why we weren't going to install a DCVA anymore. Then I found a few rare opportunities to use up the surplus pieces on very-low-flow installs, like hose-bib-supplied-systems.
Only ones Ive ever seen are tiny pvb's with no test cocks. Those were on in one hood about 30 yrs old with systems installed by the builders guy.