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The water supply is for hooking up a washing machine.

  • What's a 38 inch pipe? Most water mains are less than that. Do you mean 38mm? – Chris H Mar 28 '16 at 20:52
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    This is going to need much more details. Are you running new pipe in the walls or are you just talking about some fittings after the valve? What's going on here? Also, I'm assuming you're talking about a 3/8" compression fitting somewhere along the way? – JPhi1618 Mar 28 '16 at 20:53
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Sure, but it's going to fill slower if you do. The washing machine won't care, it doesn't fill by time, it fills by volume.

The narrow pipe may throw off your "warm" setting somewhat. If the hot and cold lines are not equal, they'll flow at a different rate.

The narrow pipe will help your "hot" setting be hotter - if it's on the hot pipe and if it's a long run. You know when you open a faucet and the hot water runs cool for a few seconds? That is the water that is already in the pipe and it has cooled off. On a smaller diameter pipe, there will be less water in the pipe (almost half as much, 3/8 vs 1/2).

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