Some people, and some local codes, require fixtures that are compliant with the Americans with Disabilities Act. If someone may visit who has special needs, or if you believe future buyers might appreciate this feature, Delta offers a range of compliant fixtures.
Documents & Specs
3/8" O.D. inlets or WF = 1/2" IPS
* Actual pricing may vary and is determined by the selling retailer/wholesaler/dealer.