Copeland 998 1661 51 Valve Plate Kit Refrigerant this replacement humidifier filter features this replacement humidifier filter features a high density porous structure that facilitates uniform water distribution across the media Installation Efficiency: Features pre drilled holes and an adjustable design to facilitate rapid wall mounting without custom fabrication you ensure precise pressure regulation and mitigate the risk of liquid slugging damage This genuine Copeland replacement part features a high grade stainless steel valve plate assembly designed to withstand the thermal cycling and high discharge temperatures typical of commercial refrigeration