Pentair Black Manual Air Relief Assembly | 273550Z Blue Square Light Accessories and Niches offering durability and ease of

offering durability and ease of installation

This large outer cartridge is designed to use with Pentair Sta-Rite System 3 SM-Series 21-inch pool and spa cartridge filter

harsh chemicals

and C502 filter systems

Pentair Black Manual Air Relief Assembly | 273550Z Blue Square Light Accessories and Niches offering durability and ease ofPentair Black Manual Air Relief Assembly 273550Z OEM Pentair manual air relief assembly. Releases trapped air to maintain pressure and efficient filtration. Features OEM replacement for Pentair FNS, Nautilus Plus, and SMBW 4000 series filters. Manual air relief valve removes trapped air from filter tank. Integrated pressure gauge for system monitoring. Improves filtration efficiency and startup performance. Durable construction for long service life.