... . EPDM Washer, ABS Insulating Sleeve 3. Sizes: 1/2" - 2" Dielectric Unionwhich is used for the water/gas pipe line, which ... 3/4" FIP x 3/4" SWT Dielectric Union 1" FIP x 1" SWT Dielectric Union 1-1/4" FIP x 1 ... /2" FIP x 1-1/2" SWT Dielectric Union 2" FIP x 2" SWT Dielectric Union 3/4" FIP x 1/2 ... " SWT Reducing Dielectric Union 4. Packaging details: 12pcs/box, 144pcs/ctn (for 1/ ...