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Phil, many thanks for your response. I'll try your suggestions and your explanations as to cause make lots of sense. I'm pleased to hear that it is very unlikely to be the fairly new shower valve (as replacing this may cause issues with the very expensive new tile job!)

could be. I've carefully determined that the ideas about other things randomly using water (washer, ice maker, etc.) are not a possibility. And note that even if I intentionally turn on other water taps or flush toilet, this does NOT cause any drop in shower pressure. Again, 99.9% of the time...

When it happens, it only happens toward the end of a long shower (not super long, maybe 10 minutes at the very most). I wonder if something could be happening with the Electric Hot Water Heater such that some sort of refill is taking place (but tank is a large one, can't recall, but it is at...

I'm in Florida. No furnace (well, an electric heat pump for AC/heat) and no humidifier. I do have an external irrigation system, but it is not on during the brief pressure loss and have noticed no leaks (and if a leak, would be consistent I suppose rather than very intermittent)

to clarify, the shower valve feeds a turn on/off that controls shower head (wall bar with handheld). And we have a separate on/off valve that feeds the bathtub spout itself.

definitely not dishwasher (don't have one, odd I know, but don't like them) or washing machine (my first thought was washing machine too). I suppose it could be icemaker, but rarely use ice, and stays full for weeks on end so rarely runs. Hansgrohe, Axor Montreux, Trim Ecostat Thermostatic...

definitely not toilet (checked for this and no running whatsoever ....and by the way we use your suggested toto toilets!). Not sure about piping size. If this was under sized wouldn't we be having lots of pressure drops, not just a split second once every 7 to 10 days?

Before getting a local plumber involved, I'd very much appreciate some thoughts on potential causes of my issue. Thanks in advance. 1. When taking a long shower, there is an almost split second sudden drop in pressure (as if someone turned OFF the water supply then immediately turned back on...

The more I look at this, I suspect this close fit may be a result of this sink having originally a separate hot and cold valve/spout with the center hole simply being for the "pull" on the sink stopper.

Thanks for the response. I have two of these sinks. you can see from the picture that one sink has the 1.5" base on the spout and the other has a 2" base (which seems will just fit so that is probably my upper limit). In both cases, the spout is 4" and really needs to be more like 5.25" to be...

My wife is in love with our 60 year old Kohler bath sink. In trying to replace the fixtures I've run into a wall. Can't seem to find fixtures where the faucet/spout has a base that is no larger in diameter than 1.5" (or just a hair more). The 9" - 10" spread or so of the three holes is in...

touche' What brands do you recommend for good reliability that have nicer than average fixtures (pressure and temp controls, with diverter). Thanks.

Thoughts on possible sources of this problem are VERY welcome. Background: New install of "KWC, 1/2" Rough Valve for Thermostatic Trims - K.37.93.61.931.38" LINK: http://www.kwcamerica.com/-hansa/doc/technical/specsheet/K.37.93.61.931.38%20Spec%20Sheet.pdf new copper lines to valve. The Tub...