First I want to make clear that I wasn't making any accusations, but there are some people in this world who don't think things through before acting. If you've ever uttered the immortal words "Here, Hold my Beer and Watch This!"... You might be who I'm talking about.

The flip side of that is "Gee, it sounded like a good idea at the time..." and I don't want to hear you utter it. Because you're usually saying that one while sitting on a gurney in the ER getting something stitched back on, or shackled to a bench at the police station - or worse, shackled to the gurney getting stitched up and the police station is the next stop.

Little air regulators are available many places - but you need to see the flow and pressure ratings before you pick one, and Discounters like Harbor Freight won't tell you ahead of time. They make 1/4" NPT fitting mini regulators that will flow 15 CFM or 45 CFM - it's all in the internal construction. I think the 15 CFM will not be enough for you (strangled chicken time) so aim a bit higher.

Grainger (http://www.grainger.com) & McMaster/Carr (http://www.mcmaster.com) are my usual Go-To suppliers. Not the cheapest, but usually still competitive - and if there's a problem they don't argue about it. Both of them can get you the oddest items imaginable Overnight.

Sometimes with McMaster you call/Internet in the order well after hours the night before or first thing in the morning, and it's there on the afternoon UPS Truck - scary efficient.

--<< Bruce >>--

Bruce, thanks for the info, I actually was looking into Grainger, also Viair makes a 200 PSI regulator.
As far as the above misunderstanding, no, you didn't make any accusations, but definitely some assumptions about my intentions for the horn. The 'whole reason I'm installing them' is not to be loud, but to sound like the Monorail, period.
Thanks!

Well since you're inside the park, you could park right next to the Rainforest Cafe in the Downtown Disney lot and have a "horn battle" with departing monorails. I dont think any CMs would notice, that is if they don't have a trained ear.....

I bet I could hear it if I were at the structure.

Ideally, the ultimate "horn battle", would be to cruise down Harbor southbound while pacing a monorail and exchanging "Shave and a haircut"; only if you're timing is right and you obey all traffic, pedestrians, and buses. And only if the pilot was paying attention and knew how to respond.

Towler:
I never thought of that. That would be the COOLEST! Of course obeying all laws, and keeping the volume at an acceptable level.
Yeah, I'll definitely give that a fun shot, with camera rolling to see if I can get a Monorail response!
Thanks!

Here's what I had in mind for the pressure regulator.

http://www.grainger.com/Grainger/SPEEDAIRE-Regulator-4ZM20?Pid=search

Gonna plumb it in line before the solenoid. No need to have two solenoids and all those t-fittings and seperate switches. I'll just adjust it manually where needed, much easier that way.
What do you think?

Couldn't add to last post.
Have 1/2" hose coming from tank to solenoid.
I assume I can plumb the regulator (which is 1/2" on both ends) using my 1/2" press-to-fit fitting from tank hose into regulator,install a male to male 1/2" fitting on other end of regulator-into solenoid, and done deal.
Am I missing anything?

Yes, like a pressure gauge between the regulator output and the solenoid valve, so you can pre-set the volume you want. You know that they start sounding good at 25, that's your Low.

--<< Bruce >>--

(Oh, and the only assumption part of that messiness a ways back was that it wasn't aimed just at you. Other third parties [lurkers] can also read the thread without asking questions, and get those ideas - I'm trying to tell them to think before you honk too. )

Thanks Bruce.
This regulator I'm looking at looks like it has a 1/4" opening at the side to install a gauge. Would that do the same job or does it have to be between the regulator and solenoid?

A single plug is usually on the Output side, look inside and see where the drilled passage goes.

Some regulators have two (or more...) plugged gauge ports on both the Input and Output, but they usually mark the ports. They can also be three or four - One on Inlet and two on the Outlet, one is for a gauge and the other a relief valve (CO2 regulators for beverage service do this a lot)...

Read The Friendly Manual (or the Instruction Sheet they toss in the box), it tells all.

--<< Bruce >>--