Well I’m looking for a manual valve will need to be sent to aus but it shouldn’t be much.
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Did you look at the manual valve horn blasters sells? It’s just like the GW version. I love mine, I use the GW valves on locomotives and I can’t tell a difference in the way the operate.
I believe he’s looking for local to avoid shipping charges. 
Oh ok…
Yea it’s $100 shipping from hb. Does not have to be local but needs to be cheaper than that for delivery
I use a 15mm “plumbing” Gate Valve, I did it as a temp measure just to see if it would work & I love it!! Works perfectly.
I’ve got a electric valve and the horn sounds great. So no rush really will hold out for one. Cheers for the idea though.