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If the leak isoccurs only when the shower is on on, yesthen the leak is after the tap and before the shower head.

If the leak is only when the shower is on on, yes the leak is after the tap before the shower head.

If the leak occurs only when the shower is on, then the leak is after the tap and before the shower head.

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If the leak is only when the shower is on on, yes the leak is after the tap before the shower head.