I make my own injection guns for twin hose. I use a regular chemlawn gun and put a brass fitting on it that I drill a small hole into. I then tap it and thread on an L fitting into which I thread a brass hose barb to 1/4" then I give the whole thing a quick solder. My injection valve is a trigger valve about. 3' from the gun. I even put a small piece of hose between my fitting and the gun so I get a swivel in there at the gun to make it easiest to untwist the hose. I've been doing that for 20 years. Works great. And for pumps I just use 12 volt surflo pumps with pressure switches. Under $200 and I have figured that they last between 5000-10000 lawn sprays.
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