Kohler1104957 Replacement Part, 1 Count (Pack of 1), Unfinished

This works great and feels like vastly more water than an equivalent aerator, which makes cleaning dishes and hands more effective. I recently purchased a six pack of non-branded "laminar flow 1.5gpm regulators" that were actually aerators (tons of bubbles, splashing and noise but feels like less effective water at the same gpm when washing dishes out hands at the sink). Unlike those, this is the real deal: laminar flow with no bubbles or splashing, and it genuinely feels and works like a higher flow rate, so helps conserve water. I measured and it is almost exactly 1.5 gpm even with our high pressure water supply.

The OEM dispels low GPM (like 1.5 GPM), for water saving. Some replacements allow 5 GPM, which flows better. The special wrench needed to replace the aerators is critical.