Sink your water deep where it won't evaporate and will get where your big roots need it most. Have you ever scratched the ground surface after a big rain or watering expecting lots of wet earth only to find only surface moisture? That's where most drip irrigation gets the water. This is fine for small plants but what about your big trees and shrubs? These 7" soaker stakes will solve the problem. Just install inline with standard 1/2" drip tubing and watch how much faster your large plants grow. The elbows are for single site application or to end a series of stakes.