Darlly 40191 FC-0121 4CH-21 PTL18P / PSI18 Filter Cartridge aosmith Supports cleaner equipment layout

Supports cleaner equipment layout

giving the installation a cleaner and more finished appearance

Helps restore proper water and air pathway support

The Waterway 660-3561 top access silent air control is designed for compatible spa systems using a 1-5/8 inch hole size and a 2-9/16 inch face diameter

Darlly 40191 FC-0121 4CH-21 PTL18P / PSI18 Filter Cartridge aosmith Supports cleaner equipment layoutA filter cartridge helps maintain cleaner circulating water by collecting debris within the filtration system, and this Darlly cartridge is designed for compatible applications referencing FC 0121, 4CH 21, PTL18P, and PSI18. When a cartridge becomes restricted or worn out, the filtration system can no longer operate at its intended level. The multiple reference identifiers give this cartridge practical value because filter replacement is most reliable