Description

Pentair® Sta-Rite® Manifold Internals 400K (Max-E-Therm) – 77707-0209 Key Benefits

• OEM Replacement – Genuine Pentair® part designed specifically for 400K Max-E-Therm and MasterTemp heaters

• Restores Performance – Rebuilds efficient gas flow and combustion inside the manifold

• Complete Internal Kit – Includes bypass valve, springs, and hardware needed to restore heater operation

Applications

• Compatible with Pentair® MasterTemp® and Sta-Rite® Max-E-Therm® heaters, 400K BTU models

• ❌ Not for 200K or 333K models (use the correct size kit for those heaters)

Tech Tips

• ⚠️ Check the manifold body — if it is cracked or corroded, you will need the full manifold replacement kit, not just the internals

• Direct fit design makes installation straightforward for service techs or experienced DIYers

• ⚠️ Always shut off gas and power to the heater before disassembly for safety

Specifications

• Part Number: 77707-0209

• Heater Size: 400,000 BTU

• Weight: ~1 lb

• Install Type: Internal rebuild kit only

What’s Included

• Internal manifold assembly with bypass valve

• Springs and hardware

• ❌ Manifold body (sold separately)

• ❌ Complete heater unit (sold separately)