Grover Fittings + solenoid

I just installed a viar 10007 kit this weekend, and ordered a grover stuttertone fire engine horn. My questions are 1. what size NPT fittings do you use for the grover horn? I can’t figure out if it’s 1/8, 1/4, or 3/8. -2. What is a good solenoid for this setup? My compressor cuts out at 150. Thanks, Scott

the grover horns are either 1/8 or 1/4 i had one on my truck at one time but cant remember off hand i dont have it any more

my hadley horn was an 1/8

yeah i think it is 1/8 on the grover

my Grover runs 1/8, you have to be careful not to give it to much air because it will sound like a duck parrot mix.

One of my videos u can hear my old one wehad it running at 150 psi