1/4" - 5/8" White Insulated Copper Coil Line Set 16' Long - Flare Nut KIT- Seamless Pipe Tube for HVAC, Refrigerant - 3/8" Insulation tape + Product Details Size - RGADJ-3012 7" Round Duct Pipe Quality Packaging carefully packaged

+ Product Details Size - 32"w X 10"h is the size for the duct opening measurement only

But for plumbing it will fit onto a pipe that is 1/4" on the "inside" (ID) which equals to 1/2 on the outside

This ensures smooth

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 18" OR 18" x 26" duct opening (measured at the opening)

1 4" 5 8" White Insulated Copper Coil Line Set 16' Long Flare Nut KIT Seamless Pipe Tube for HVAC, Refrigerant 3 8" Insulation tape + Product Details Size RGADJ 3012 7" Round Duct Pipe Quality Packaging carefully packaged + Product Details Size 32"w X 10"h is the size for the duct opening measurement only But for plumbing it will fit onto a pipe that is 1 4" on the "inside" (ID) which equals to 1 2 on the outside