PVC Cross Adapter - MHT x NPTThese PVC cross adapters have two 3/4" MHT (male hose thread) connections opposite of each other, with various NPT and MHT connections positioned perpendicularly to them. Use the drop-down menus above to select the fitting types that match your needs. Please note: Thread tape is recommended for threaded PVC ends. Hose threads require a garden hose washer for proper sealing. Matching PVC Pipe & Fitting SizesSelecting the correct size fittings to match your PVC pipe can be confusing if you do not already know the size of PVC pipe you have. All plumbing grade PVC should have size and rating information imprinted on the outside of the pipe. PVC pipe is named for the inside diameter, commonly referred to as "a nominal size". If not able to locate this information then simply measuring the inside or outside diameter will help you determine the correct pipe size using the table below. Schedule 40 PVC Pipe Size TableFitting selection is easy once you determine your PVC pipe size - just match the nominal pipe size to the corresponding fitting size. Example: If your pipe measures 0.824" ID (inside diameter) or 1.050" OD (outside diameter), which is 3/4" PVC pipe, you will select 3/4" PVC fittings.Nominal PVC Pipe SizeActual Outside DiameterAverage Inside Diameter1/2"0.840"0.622"3/4"1.050"0.824"1"1.315"1.049"1-1/4"1.660"1.380"1-1/2"1.900"1.610"2"2.375"2.047"3"3.500"3.042"4"4.500"3.998"6"6.625"6.031"