Finding Source Line to Vavles
My existing valves have been leaking for quite a while and one is so bad it is now finally losing pressure and draining out the sprinkler heads. I'm going to replace all four (two for front, two for back yard), since three of them are original and 20 years old and one is 10 years old.
My first thought was "I need a master shutoff valve for these" since I can't find one and must close the household water main to work on them.
But I'm having trouble finding which one is the supply to the area.
Here is the pic of the valve area in backyard (the 3rd is the worst, shown with severed electrical to solenoid and cap removed):
Here are the lines to/from the area (located in the front yard, notice this is otherside of the same fence in both pics):
I have four (maybe 5) 1" lines going to the area but I can't tell which are supply or distribution -- in fact I'm confused why there would even that many in this spot. Two go to the front (where this pic is taken), so shouldn't there be only 3? Unless the backyard two also follow the front yard then make a U-turn and head back a few feet later.
Do I need to severe them all or dig out a whole lot more to verify where each one goes? Because all are touching, when I turn on the supply I can't tell by "feel" which one is flowing for which valve.
Or should I just toss out the whole idea of a master shutoff valve?
Here are the parts for the replacement project (only 1 of each item shown):
This is pretty much all that's needed (except tools), correct?
Thanks in advance.