Pentair O-Ring #2-244 Buna | FULLFLOXF Backwash Valve | 270197Z FC9530 measure your existing element's length

measure your existing element's length and outer diameter and compare them against your filter's owner's manual spec — cartridge elements from closely numbered Hayward models can look similar but differ in key dimensions

locate the rating plate on your MasterTemp heater and confirm the model number ends in "250" This kit is sized specifically for the 250

Brand Equipment Line Model / Part Number Notes Pentair (formerly Rainbow) Model 300

It must be ordered separately when a natural gas to propane fuel conversion is required

It is ideal for use with hard water because it helps neutralize small quantities of stain-producing minerals such as iron

Pentair O-Ring #2-244 Buna | FULLFLOXF Backwash Valve | 270197Z FC9530 measure your existing element's lengthThe Pentair 270197Z is the OEM replacement O ring for the FULLFLOXF Backwash Valve the end cap O ring that maintains a pressure tight seal at the valve body. IMPORTANT: 2 REQUIRED PER VALVE This listing is for one (1) O ring. The FULLFLOXF Backwash Valve requires 2 of this O ring for a complete service. Add 2 to your cart before ordering. IMPORTANT: LUBRICATION REQUIRED SOLD SEPARATELY Always lubricate this O ring with a silicone based lubricant