Lifegard Aquatics 3/4" MPT Low Profile Strainer Available in 1/2 (1.27 cm), 3/4 (1.91 cm), 1 (2.54 cm) sizes, 1  (3.81 cm), 2 (5.08 cm) Custom Installations are easier and safer with all parts included in convenient Kits Tock color is jet Black to match Acrylic Tank backgrounds Note: Item is manufactured 3/4" USA plumbing size and the male thread is designed to fit into a 3/4" female fitting.The inside dimension of the fitting will be 3/4".Try to screw the fitting into a 3/4" USA female pipe thread fitting and it will fit.