The hansgrohe air gap is necessary for kitchen faucet installation in certain cities. Please check with your local codes to see if this product is required for your area.
Installation Instructions
Specification Sheet

Weight	0.44 lb
Color	Silver Tones
Finish	Chrome
Finish Type	Polished
Height	3.00 in.
Length	11.22 in.
Room	Kitchen
Type	Air Gaps
Width	4.13 in.
Inventory Number	HAN04214000
MPN	04214000