Water shutoff connection for blow out

After twenty plus years of forgetting to turn the one off that comes outside and under my deck I finally just cut it off. Every year my wife asked if I remembered and every year I lied and then forgot about it. Nothing like getting in a crawl space looking for a shutoff valve in the middle of winter when a pipe burst.
 
What kind of compressor?
some tiny Lowe's guy I got as a gift years ago. It sits unused most of the year given it's so small and doesn't have the CFM/capacity I need in the garage. Great air line I upgraded, but tiny tiny tank.

Is the shut off valve specifically for blowing the lines out? If so, remove the current valve and use a compression fitting and 1/4 turn ball valve. From there adapt to a 3/4" on the other end. This would allow for the RV blow out adapter to be used.
Indeed it is! There's a 1/4 ball shutoff valve proximal to this pic for the water supply. The fitting in the pic is distal to the shutoff valve and meant to be used as the blowout. It'd of been cool if they did a 3/4" RV blow out, but I think they used what was on their truck. In this case, a water supply valve for a toilet.

After twenty plus years of forgetting to turn the one off that comes outside and under my deck I finally just cut it off. Every year my wife asked if I remembered and every year I lied and then forgot about it. Nothing like getting in a crawl space looking for a shutoff valve in the middle of winter when a pipe burst.
I've had to replace pipes that I'm trying to clear at least twice at this point. That's what I'm trying to avoid this year!

Again, thanks gents!
 
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Use a tire vale stem. I use them all the time for things like this. I recently had to do this to blow out an ac condenser after the compressor kicked the bucket.
 
Use a tire vale stem. I use them all the time for things like this. I recently had to do this to blow out an ac condenser after the compressor kicked the bucket.
Thanks. I think the valve stem won't keep the pressure in the line though as it'd likely just blow out the sides along the threads.
 
I use a rubber tipped blower nozzle,

View attachment 299485
To follow up and close this out, after a brief search at big box clueless employee "hardware" store search, I ultimately threw up my hands at my attempts with finding a snap/screw in bespoke solution and just tried using this type of attachment. It worked! I was able to dial down my little air compressor regulator for appropriate pressure and let 'er rip! It took some doing and opening/closing of the valves where I was pushing the air through, but ultimately won! Thanks again!
 
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