Products Search by Part Number Products>Air Dryers & Main Line Filters>Air Dryers>Refrigerated Air Dryers>Dryer Accessories>IDF/IDU, Piping Adapter IDF/IDU, Piping Adapter Set Adapter for converting thread type of an IN/Out fitting for air dryers from Rc to NPT For converting thread type of an IN/Out fitting for air dryers from Rc to NPT Copper alloy Configuration Options Select Product Options Select values from the drop down lists or make appropriate selections to configure the part number. Applicable Dryer -- Pick an Option -- 601 (Male Thread Side A, R 1/2; Female Thread Side B, NPT 1/2; IDF4E, IDU4E) 603 (Male Thread Side A, R 3/4; Female Thread Side B, NPT 3/4; IDF6E TO 11E, IDU6E TO 11E) 604 (Male Thread Side A, NPT 1; Female Thread Side B, Rc 1; IDF22E, IDU22E) 605 (Male Thread Side A, R 1; Female Thread Side B, NPT 1; IDF15E, IDU15E) 606 (Male Thread Side A, NPT 1 1/2; Female Thread Side B, Rc 1 1/2 ; IDF37E, IDU37E) 607 (Male Thread Side A, NPT 2; Female Thread Side B, Rc 2; IDF55E, 75E, IDU55E, 75E) 609 (Male Thread Side A, R 3/8; Female Thread Side B, NPT 3/8; IDF1E TO 3E, IDU3E) Options in: Gray are not compatible with other selected option value. Red conflict with another selected option value. Amber are not recommended.