Based on this product's specifications, here are some alternatives and similar models
Thermostatic cartridge FERRO RKPT1-C7 M30x1.5 for 39 mm profile manifolds
Summary description:
Thermostatic cartridge FERRO RKPT1-C7 with M30x1.5 thread designed for installation in 39 mm profile manifolds. This spare part regulates flow/temperature in underfloor heating or radiator manifold systems, matching FERRO profiles with 39 mm spacing. Key details: brand FERRO, model RKPT1-C7, thread M30x1.5 and intended for use as a reactor element in heating distribution assemblies.