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The blue strip is friction fitted. As long as you use a 1/4" drill bit, and are careful when drilling, and you use Toro brand blue stripe drip line, you should be able to push the drip line through the hole. I've had mine for over 1 1/2 yrs now, and never had a problem with any of the lines coming off.
Are you referring to the 1/4" drip line? If so, those are just friction fitted into the holes. If you're using a different brand of dip line, it may be thinner or thicker than the Toro brand, so you'll have to experiment with the hole size.
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