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Does a higher overflow cover actually raise the tub’s fill level?
How much of a tub’s usable capacity is set by the overflow outlet itself, and how much can vary with the cover’s opening height? I’m wondering whether a replacement cover with a higher opening can meaningfully raise the water level, or whether the tub’s overflow design still sets the limit.
Would the drain linkage or stopper mechanism also affect which covers are compatible? I’d be cautious about treating a higher opening as a safe way to fill farther, since water could spill over the tub edge if the overflow can’t keep up. What’s the practical difference between changing the cover and leaving the existing assembly as designed?
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2 replies
The overflow’s effective intake height is usually the main limit. Water reaching it is directed into the overflow, but it may not carry away water fast enough to prevent spilling over the tub edge. A cover can raise the level only if its opening is the lower restriction and the replacement actually raises the effective intake; changing the cover’s visible opening alone may make little difference. The exact effect depends on how the cover and overflow assembly line up.
Yes - the stopper style matters. With a trip-lever tub drain, the overflow plate is connected to linkage behind it, so a replacement needs to suit that assembly and its mounting; a cover chosen just for a higher opening may not work with the existing linkage. Other stopper designs may have no linkage attached to the overflow plate, so check the replacement’s compatibility with the existing setup.
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