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1" Insert x 3/4" MPT Adapter is used to couple a 1" rigid hose to a 3/4" FPT (female pipe thread) fitting. Along with coupling the hose with a threaded fitting, it also reduces or increases in size between a 1" O.D. (outside diameter) opening to a 3/4" O.D. Previous SKU: G-00171 For more information on Drip Irrigation, visit our Drip Irrigation FAQ (Frequently Asked Questions) page.