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Rail sleeve for inside 7/8" tubing. These sleeves are used when you are replacing T-fittings on original Whaler welded railing kits where the T-fittings are unable to be removed. You will cut the railing where the T-fitting is located, insert the rail sleeve, JB weld in place, and install the new T-fitting to cover the split.
Dimensions are shown in last two photos.