MistAway Union Tee 1/4" (10-pack)
Tees are used to host nozzles or branch tubing.
Nozzles may also plug into the other fittings too (elbows, & couplings.)
A TEE is used at the base of the tree, tubing is run up to about eye-level.
Then use either an ELBOW with a straight nozzle or a COUPLING with an angle nozzle.