M30 plastic adapter for Herz M28 thermostatic valves
Datyson 1.25 inch Filter Adapter From M30*1 to M28*0.6 Threads Astro Telescope Accessories
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