What is the minimum radius the 515-08-670 or the 510 can be turned 180 degrees? My well pressure is set near 55 psi. Do I need the Senninger PRV? I have a variety of things to water, strawberry beds 8-50 rows @ 4' o.c., intensive beds of produce 4' wide (4'x12' connected by 3'x4' then 4'x12 connected by 3 x 4...), raspberries in 50' rows and aspargus in 100' rows. I am wondering if I can cicle around up to 900'runs? Thank you