I just want to know your exper. with them, thats all.

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My department has two, one each carried on the engine and ladder, they are the type that attaches to the Navy Nozzle. I can't ever remember using them though, aside from in training. I've posted pictures of them before in another thread on here, somewhere.
Seen them used for that!
I think the biggest thing with all of the piercing nozzles I've seen, they don't have shut offs so guys don't bother with it! Take an 1 1/2 nozzle that has a removable tip from the shut off valve, remove the tip and attach it to the piercing nozzle, works great but you do have to be more careful when hitting it! The other thing I've seem is a short length of hose and a gated "Y" for a valve.
The piercing nozzles works really well with class "A" foam on bales, garbage, anything that is compacted or difficult to get into!
You can purchase piercing nozzles with a bail and a ball valve attached, or you can purchase a stand-alone bail/ball valve attachment and either mate it to the piercing nozzle's female intake or use a short pony section of 1-1/2 or 1-3/4 to mate the two.
Try it with Class A foam at 0.5% - the combination gets great penetration in smouldering hay bales.
We have one, usually use it on fires behind the dash usually the cars are a total loss anyway or thru the headlamp. Don't do many hay bales.
The five footer I mentioned has a bail and ball valve. We really don't use it much but in moblie homes and metal sheds, like was already talked about Ben Waller.
He is right there great for that.
Piercing nozzle plus a ball shutoff equals a piercing nozzle with at-the-nozzle control.

Sometimes the vendors even put the two on the same page.

Here are two different POK versions....

...or the FlameFighter versions...

...or one of the 90-degree versions...

Or the smaller version that comes with the TFT Pro Pak...

...etc.
I see a lot of folks stating they use them on hay bail fires, watch out for those hay bleve's.
If I used a dry chem on our car fires,I'd be BANKRUPT(too many car fires). We've got a piercing nozzle,don't use it often but it has it's place. If you have a piercing nozzle,you'll find some novel ways to use it.
Hay bale fires are NO laughing matter. VERY dangerous when tons of hay start shifting or you step in a void created by them. Plus they can be a source of a very fast moving,very intense fire.

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