We measure the line before install, so we know how much drip line per valve. This is the first time I purchased from Sprinkler Supply Store, but have installed about a 1000’ of drip line to date, and know my measurement marks are correct. Unfortunately, the drip line I purchased was approximately 40' short of the 250'. After advising the Sprinkler Supply Store, they bent over backwards to make it right. I really can't say enough about how great their customer service was to me, and I would definitely go back to them for future purchases based on this experience.