Pentair 3/8" MPT Autofill Float Valve | 261058 O395 particularly if you are unsure

particularly if you are unsure whether your Rebel is a current or pre-2018 model

even coat of silicone-based lubricant to the O-ring before seating it — this prevents tearing during installation and helps the lock ring thread on smoothly without cross-threading

Size: 27'/28'

Also known as: FS2004

or develops a leak at the housing seam

Pentair 3/8" MPT Autofill Float Valve | 261058 O395 particularly if you are unsure3 8" MPT Autofill Float Valve for Pool Water Management The Pentair 261058 is the OEM replacement 3 8" MPT autofill float valve, designed to automatically maintain your pool's water level by controlling fill flow through a standard 3 8" male pipe thread connection. What It Does The autofill float valve opens to allow water to enter the pool when the water level drops below the set point, then shuts off automatically once the correct level is restored.