lse, why not just get one and have it as a spare? You never know...

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Consists of:
1 x Cap

\r\n

Materials used:
Polypropylene Resin

\r\n

Product Dimensions:
23mm (0.9\") Inner Diameter x 48mm (1.9\") Outer Diameter x 3mm (0.12\") H

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Please note: This water tank cap is only compatible with Pro Water Tank With Mounting System / 20L, Pro Water Tank / 42L, Pro Water Tank with Strap / 42L. Pro Water Tank With Mounting System / 42L.

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Front Runner Pro Water Tank 20L/42L Cap

Front Runner Pro Water Tank 20L/42L Cap