This question reminds me of a question rookie communications techs asked me about how much equipment they should stock their trucks with to cover daily job needs. You know, because it costs so much gas to drive all that extra stuff around.
My question in return was this: If you want to spend lots of time on the road, don't load your truck with anything extra. That way, you can drive to your heart's content finding something to complete your jobs. If you want to get promoted, load your truck with all the stuff the whole team might ever need. Then we can trade with each other when I have something you need or vice versa.
Much like your situation regarding plumbing, you never really know exactly how much piping or what specific fittings will be needed without some sort of site survey or a set of blueprints. The rule of thumb is you nearly always need extra. This is why it costs a certain amount for a plumber to drive to your house: it takes a good amount of skill and risk to have what you need on his truck. Much less you and the other four customers of the day.
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