Laneman
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I have an old 3 handle Delta setup in a fiberglass shower. The handles are clear plastic. When the shower head is pointed down and splashing the handles, water comes through the wall of the shower. When pointed away from handles there is no leak. I've sealed everything I can think of yet it still happens. I siliconed the chrome cover plates on all 3 handles, I unscrewed and sealed the chrome sleeves at both threads, also sealed the tub spout. The leak appears to be coming through the center valve area and is dripping through the fiberglass. There are no cracks in the fiberglass wall. The only place I haven't been able to seal is the valve stem itself. Is it possible that water is splashing into the plastic knobs, through the valve stems, then into the wall? If so how can I seal the stems, or can I buy new ones?