M28 x 1.5 Female Radiator Adaptor to Thermostat/Thermostatic Head M30 x 1.5 Male M28-M30 M28F-M30M (BLUMKRAFT) : Amazon.com.be: Tools & Home Improvement
EYSDON M30*1mm Male to M28.6*0.6mm Female Threads Conversion T Ring Adapter for 1.25 Inch Telescope Filter Converter - AliExpress
Radiator valve adapter M28 > M30 + Pin Extension by RNLDNKP | Download free STL model | Printables.com
DANFOSS - Adapter range Living for corps M28 MMA, Herz and Comap - SMARTHOME EUROPE