I think the reducer is actually 1/2 x 1".
http://www.menards.com/main/plumbing/rough-plumbing/pipe-tubing-hoses-fittings-accessories/shop-all-pipe-fittings/brass-pipe-fittings/1-fip-x-1-2-fip-lead-free-cast-red-brass-reducing-coupling/p-1444442662517-c-12605.htm?tid=1226528020085731181