Check your individual sprinkler heads for radius adjust control... otherwise, check to see if your automatic valve has a flow control adjust screw on it. (Standard Valves should not be used to regulate flow unless they are dsigned for that purpose) If not, consider installing a valve that incorporates this feature. You could also invistigate installing a line pressure reducer.

This has discussion has a lot of great information. I'm not sure if everyone's questions have been answered but we have a very in depth article on our site regarding the difference between the Delta 17 and 17T series trim kits. It gets pretty heavy into the details. Others above have given a pretty good explanations in this discussion but I think some aspects may still be a little unclear. Here's a summary of the differences detailed in our article. 1) Water pressure: 17 Series cartridges operate using pressure balancing techniques as opposed to actually sensing temperature. This means that water pressure from a 17 Series trim will be less than a 17T Series. 2) Temperature limit stop: If you live in an area where seasonal temperature differences are greater, you may have to adjust the temperature limit stop in your 17 series shower periodically. You will never need to do this with a 17T series. 3) Accuracy: 17T keeps the temperature in a tighter range. If you adjust the temperature handle more often the 17T will give you more predictable results with less fiddling around required to get exactly the temperature you want. 4) Shower systems with multiple spray outlets: In the case of a shower system you will require more water pressure and a 17T will be better. You will also get better pressure from a standard showerhead with a 17T. These are some of the reasons the price is higher. For more info check out our article: https://faucetlist.com/blogs/buying-guides/delta-thermostatic-shower-faucet-trim-kit-cartridges-monitor-17-series-vs-17t-series-tempassure read the guide

Where I live, Lowes sells brass hose connecters with 1/4-turn ball-valve that will control flow from full-on to full-off or anything in-between and will stay where its set. I have them on the ends of all of my hoses along with quick-disconnects as a convenience. Well-built and inexpensive. Believe mfg. is Gilmour but I don't see it at their web-site -- only the plastic ones which you don't want.

Yes but don't panic all you need to do is install a tee in the system and a female connecter and then just thread the valve in. put it on the hotside. although this is an open sytem what would happen if there was a pump in line producing hot water so you have hot water all the time.