Image HT-Series Correct Connect® Flushface Flange Sleeve Female Threaded Coupler Markets Construction, Energy / Oil & Gas Product Options Part Number Length Body Size Thread Thread Size Material 4HTF4-FS 3.02" (76.7 mm) 1/2" Female NPTF 1/2"-14 Steel 6HTF6-FS 3.70" (94.0 mm) 3/4" Female NPTF 3/4"-14 Steel