I'm pretty sure I've seen a reducing bushing at Lowes that reduced that far
down. The bushing fits in an elbow, coupling, or tee, and then you can
connect the smaller pipe to the bushing. I think I saw one for 1/2" too.
In any case, is there some reason you can't use two reducers in series to
step down to the size you need? It seems easier to me than special ordering
a fitting if you can't find it locally.
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