I did not because I wanted the falling water column in the riser pipe to assist unseating the air valve and the impeller style pump isn't harmed by a little reverse flow. The water in the lines from top of reservoir to height of distribution manifolds will drain out to plants once pump is shut off. Also my installation of air valve is not perfectly horizontal but is tilted down maybe one degree. I found less water burbs during pump turn on in this position. Did I explain well enough to make sense? I am a bit high.
HEKA is hitting hard!
edited for spelling.