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Shower Trim Plate 25 mm Depth Extension Collar
A 170 mm OD, 25 mm deep ribbed collar that fits between a round shower-valve escutcheon (6.75–7.5 in / 172–190 mm plates) and the tile when the valve body sits too far out of the wall after a retile. It closes the gap so the trim plate seats evenly and can be sealed. The 124 mm bore clears the valve body and the plate's own screws clamp the collar in place. Internal ribs keep it stiff, there's a weep notch at the bottom, and you can saw it down for shallower gaps.
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