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You can buy USCG approved marine fill and vent hose from NAPA if your location stocks marine items. They sell it by the foot.

Any full size marine chandlery or Engine or boat dealer will sell it by the foot.

When comparing pricing note if it is rated A1, A2 etc.

If you don't have the hoses out to measure, use a piece of string to determine length, taking into account any turns.

Web retailers such as Hamilton Marine, Defender, Cabellas are good sources to shop.

Measure 3x, cut once.