Hydrologic's reverse osmosis filter tubing in blue. Sold in lengths of 50 feet with an outer dimension of 3/8". Extra tubing can be useful for customizing your indoor hydroponic water filtration system.
| Size | 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38 |
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