Pentair Sta-Rite MasterTemp 250 Natural Gas Orifice (460739) controlsystemparts and this Darlly Filtration cartridge

and this Darlly Filtration cartridge is designed for compatible applications using the 40508U reference

That makes it a versatile addition to plumbing and pool-equipment service

Designed for compatible Amerlite and Astrolite I style applications

It helps restore the fit

Fits compatible Hayward SwimClear and Pro-Grid filters

Pentair Sta-Rite MasterTemp 250 Natural Gas Orifice (460739) controlsystemparts and this Darlly Filtration cartridgeThis natural gas orifice supports fuel metering in compatible MasterTemp 250 heater applications. It is used when the heater requires the correct natural gas specific component for combustion service or conversion related work. The right orifice helps the burner system receive the intended gas flow for the model and fuel type. Because improper gas parts can create unsafe operation, this component should be verified against the heater and installed by