Siemens 171A-10302S 0.5″ 2W 1CV Stainless steel BALL Valve+GDE131.1P

Amazon.com Price: $220.53 (as of 26/07/2021 07:49 PST- Details)

Make sure this fits by entering your model number.
Valve pattern : 2-way
Valve cv/GPM : 1