Is there such a thing as a 1 1/8" water spigot reducer?
Search for: 1" female NPSH to 3/4 GHT male


  The thread standard for garden hose connectors in the United States and its territories is known as "garden hose thread" (GHT), which is 3/4" diameter straight (non-tapered) thread with a pitch of 11.5 TPI (male part has an outer diameter of 1 1⁄16 inches (26.99 mm)). –Wiki


1 1/8" pipe does not exist. More likely, you're trying to put a 3/4" GHT hose on a 1" NPSH spigot. You're measuring the OD, standard pipe goes by ID (e.g., 3/4" pipe has a one inch Outer Diameter).

According to jgbhose.com, female NPT is not compatible with male NPSH (although I think it might work well enough). You could try NPT if you can't find any NPSH fittings in the isle. Just make sure that whatever it is, it has a rubber washer. 



Most of this is research and also some guess work, as I've never dealt with 1" garden hose. Verify your fitting size and thread type before making any purchases.