Looking at the old problem with de-limiting the water flow in a modern
shower head. The new one I bought, a Delta Supreme, has a standard five
foot hose with an anti-siphon valve at the top end and a plastic insert at
the handheld end. The hose appears to be 5/16" ID, the anti-siphon end has
a set of eight 5/64" holes, and the plastic insert is 1/4" ID. By my
calculations, the hose has an area of 0.077 in2, the anti-siphon piece has a
total open area of 0.038 in2, and the 1/4 inch fitting has an open area of
0.049 in2.

At a water pressure of about 70 psig, should I assume that the 1/4 inch
restriction (or the even smaller multi-hole restriction) will limit the
water flow to below 2.5 gpm, or should I be looking for something else even
smaller (more restrictive)? Just thought I'd ask before I started drilling.

- Magnusfarce