1 Castel solenoid valves are Widely used in refrigeration and air conditioning component industry. We have been working on this for over 40 years.. 2 Castel coil has been carefully designed to meet the CE161-1 standard, and it continues to work under extreme conditions.. 3 Castel new fixing system provides 100% guarantee.. 4 Castel nut system with O-ring seals ensures waterproofing and simplifies the integrated side connection of the coil at the same time.