#17 in Garden hose parts & connectors
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Reddit mentions of Underhill A-HBT Tap for Using Pressure Gauge on Hose Bibs, 3/4-Inch Hose Thread by 1/4-Inch Tap
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Reddit mentions: 1
We found 1 Reddit mentions of Underhill A-HBT Tap for Using Pressure Gauge on Hose Bibs, 3/4-Inch Hose Thread by 1/4-Inch Tap. Here are the top ones.
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Solid brass 3/4-inch female hose thread adapterDoes not include pressure gaugeAttaches to outside faucets
Specs:
| Height | 1.5 Inches |
| Length | 1 Inches |
| Width | 1 Inches |
Okay, in that case I think this is what you need. Note that this is actually a 1/4" NPT thread on the pressure gauge--frustratingly NPT thread sizes don't match up to any actual measurable dimension on the fitting itself, but for reference the OD of the threads on a 1/4" NPT fitting is about 1/2". Be sure to use teflon tape on the NPT side, as always for tapered threads.
Edit: This is as far as I can tell, anyway, I didn't find something that said specifically the size, but I've used a lot of this size fittings and 1/4" NPT looks right. You can find charts online to find out what the diameter measurements actually are to check against your pressure gauge. I'm surprised this is so hard to find! Seems it would be rather common.