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These Viton O rings from Pegler Yorkshire are suitable for use on solar installations with Xpress solar and Xpress copper fittings only and are available in a range of sizes.Features & Benefits: Pegler Yorkshire Viton O Rings x 20 Rings For Solar & Copper Installations - 28mm, O ring, Used with Xpress solar and Xpress copper fittings only, For use on solar installations, Range of sizes. Pegler Yorkshire Viton O Rings x 20 Rings For Solar & Copper Installations - 28mm Synthetic Rubber 39102