The high-flow valve was recommended for the whirlpool tub I purchased.

Worked well, but plumber would have preferred the flexibility of the non-rigid variety, so I would recommend checking with your plumber prior to purchase.

Works as designed. Make sure you hire a competent plumber who knows how to follow directions and knows how to solder. My plumber installed it in reverse and then corrected it but it was leaking. Maybe have it come with threaded fittings so soldering isn't required.