Pentair PLM Filter System Air Relief Valve Assembly || 25010-0200 AVSC Single Standard Top Drain The tube cover (blue) is

The tube cover (blue) is a replacement part that was made by Hayward

Hayward Navigator V-Flex Assembly - Handle-Navi V-Flex

and finally

This handle assembly with hardware is designed to use with Zodiac CV and CL series cartridge pool and spa filter models CV340

Pentair PLM Filter System Air Relief Valve Assembly || 25010-0200 AVSC Single Standard Top Drain The tube cover (blue) isPentair PLM Filter System Air Relief Valve Assembly 25010 0200 This air relief valve assembly is designed to use with Sta Rite PLM pool and spa cartridge aboveground filter System and also compatible with Sta Rite PLD pool and spa D. E. aboveground filter System. Fits with Sta Rite System 2 Modular Media PLM Series pool and spa cartridge filters model PLM100,PLM125, PLM150, PLM175, PLM200,PLM300 and also fits with Sta Rite Separation Tank Assembly