CAD$0.05
(US$0.05)
Use goof plugs to close small punched holes made for drippers, 1/8" or 1/4" fittings in 1/2" or 3/4" tubing. Keep a supply so that you can easily change dripper locations to suit your needs. The large end can be used in a hole that is worn oversize.
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One gallon per hour.