When I was growing up, I remember my dad asking my mom to save the empty milk cartons. She’d wash them out and set them on the counter in the laundry room. I couldn’t figure out why he wanted empty milk cartons. Then, one day I went out into the garage and saw him cutting off the tops of the milk cartons and putting various plumbing fittings in each of them. I first learned about the different kinds of fittings by helping him. Once they were sorted, I would count how many of each ...

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