Rainbow Automatic Chlorine/Bromine Feeder Replacement Tubes, These packs of two black tubes are perfect for Rainbow 320 and 322 models. Each tube is 7 3/8inch long with a 1/2inch ID and 5/8inch OD. These tubes are manufactured to exacting standards to specified tolerances to proper fit in stock and aftermarket parts, will The chlorinator body is connected to the plumbing tee. The 1/2inch uniform ID of the tubing fits perfectly into part number R172272 1/2 inch NPT 90 degree tube fitting with nut and part number R171097 tube support spring, metal spring wrapped around short black tube on the length. Color: Black Material: PVC Package Contents: 2 x Flexible Tubes replacement Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.