Hi, Sorry! I've been laying out my tubing, and figuring out 1/2" tubes also come in 1/2" ID sizes. Back & forth to the store for different sized adaptors ... I have a 25 psi regulator on the water source set-up. I'll also get a pressure gauge, you're right, it would be good to know the pressure to the house anyway. I never thought about the flow rate ... I'll measure it all in a bucket before I start actually watering - jeez! Sort of important - thank you. :) I have 4 - 1/2" hoses, with no more than 40' or so of each. They will each have varying lengths of 1/4" hose running off them, no more than 10-12'. I have several 1 GPH heads along each hose, most at least 18" or so. Only one 1/2" hose station, the one for the shaded bed where the valves are located, will have heads running directly off of it, but only 8 or so; it's not a long line. So, just to be clear - I add the # of GPH's, and they need to be under 80% of hose bib total ... I've got some calculating to do! I'll be running each station for a different length of time, for a different # of days (vines vs. succulents vs. shade, etc). I have 153 plants so far, so I've already exceeded that, right? I'll have to water on different days. I'm not setting up the anti-syphon valve system, including attaching my hose to a separate valve, until I have the irrigation hoses all laid out and working, and the watering timed right, just to be safe. The current manual set-up is cheap enough, although not very sturdy, and my kitchen timer goes up to 9 hours. I don't even have my shaded bed planted yet; I'll wait for the permanent valve set-up (so I know what I have to hide). When I do get it set up, then I'll add the multi-station timer to work with the solenoid/anti-syphon valves, and the kitchen timer won't be used any more. It'll work for this manual system for now, so when 1 station is done being watered, I can turn off that valve, and then the next valve can be shut off when that's done and so on - that is if they're all being watered at the same time, which I don't think I can do with the pressure issue. OK, I'm off to finish the hoses and do some math - I always liked a good word problem! Thank you!

Good suggestion and one I had as my fallback, certainly. But I fixed the problem over the weekend. Basically had to replace an o-ring that was busted under that 2nd hex nut I mentioned above. I was worried that it was a fixed-nut, but I managed to free it loose. Strange that there were 2 nuts on top of each other. The top nut secured the handle to the unit's shaft (there's also a screw that fasted the handle itself to the shaft)...and then the 2nd hex nut opened up the guts of the unit. I was worried about how the hose bib was fastened to the piping (either threaded or soldered) so I'm glad I was able to figure it out before going to that option.

if repacking it did not work, just go pick up a new one. most fo them screw on anyway, so just kill the water, drain teh pressure, and replace.

i guess I found the answer with google. I have to order this attachment, and I have three hose bibs so not too happy about ordering three of these. Our previous house was 20 years old, and we never had a problem with frozen pipes or leaking hoses. I’m not convinced I needed these. https://m.youtube.com/watch?v=_Zl1pO6LBvQ https://smile.amazon.com/gp/product/B01N07XLE6/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1