So I have a couple years of sprinkling repairs behind me. And more when grandpa took me around as a kid. Today was a great one. Went to a home last night. A zone wasn't turning on. Quick fix.. just swap out a manifold. Well in turning each one on to see which one it was i run into one that didn't turn off. Talk to the customer and agree to replace all 6 of them (2 boxes). He was going out of town the next day (today) so I told him i would run to my supplier that night.. well I got there 5 mins after they closed. Bummer. So I figure ahhh maybe big box crap for this one... so I run to to Ace and Lowes.. all they have are Orbit valves.. yuck... these valves are everywhere out here. They manufacture them 30 miles away. I am always replacing them and will not use them for ANY of my repair work. I call the guy and say I can reschedule some stiff the next morning and be there right after my supplier opens.. All is good. Get up, buy the stuff and get to diggin. Well I could have sworn I saw 3/4 poly mainline the day before... nope... its 1"... look in my parts boxes.. not one fitting (I know I need to get caught up and re-organize things) Anyways I run back to the supplier, get the freaking part and put the manifolds in. Running through each one and they are all good. Except the last one... Turns on for 2 seconds then plunk.. nothing. Oh crap, something is in the line. Did it find it's way in when I ran back to the supplier? We try to back-flow.. nothing but some muddy water. I dig down at the closest sprinkler... 3/4 inch poly.. but 1" was leaving the manifold?! This zone goes under some concrete steps mind you. I guess where it might go under and get lucky.. but still 3/4. Hmmmm... The valve box is 15 feet from the corner of the house.. maybe he reduced to 90 on teh elbow there. So I dig and follow that line.. no turn at the corner.. poly line... just meanders back and forth on its way to the concrete. I end up digging every 10 feet and find the reducer halway... yup 2 half inch rocks, some gravel and sand. Get it all put back together and test. Ummm it turns on, great pressure.. but why wont it turn off? I just put the freaking thing in. Pull the manifold apart, put new top and rubber on.. still nope. Ran and exchanged the manifold. The new one works. Wire up and check.. all good. Customer left on trip while I am back-filling. So yes lesson learned.. PROTECT OPEN PIPES! Need to go buy some end caps.. haha do they even make them for poly pipe? And, the $360 repair job turns into $670 but it was known that I might have let the rock in.. so I eat that and charge the $360. Needless to say I didn't get done with the other stuff today.... CAP THOSE OPEN ENDS!