Weil McLain 590-317-550 Gasket
The Weil McLain 590-317-550 Gasket is a 5.25 in. by 10.00 in. flat gasket catalogued as a T-heater plate gasket ("Gskt T-Htr Plt 5.25 x 10.00"). Distributors list it as "Gasket T-Heater Plate, Size 5.25 x 10.00 Inches." A plate gasket seals a heater plate to its mating surface, and its size is part of the part number: a gasket that is a few tenths of an inch off will not seal around the studs and the opening.
Weil-McLain uses several heater plate and cover plate gaskets with similar sizes, and they are easy to confuse. The 590-317-579 is catalogued as a gasket for a rectangular heater cover plate, shown on its parts list with the 389-900-103 rectangular tankless cover plate kit. The 590-317-550 is its own number, so do not substitute one for another on size alone: compare the shape, the 5.25 in. by 10.00 in. dimensions, the stud and bolt hole pattern and the opening to the gasket you are replacing.
Replace a plate gasket every time the plate is removed. Scrape the old material off both mating surfaces, check the studs for corrosion, and seat the new gasket per the manufacturer's instructions. Tighten the nuts evenly in a cross pattern so the gasket compresses uniformly, and snug them again after the boiler has heated and cooled once. Look for weeping or staining at the plate edge on the first firing. A plate gasket that is over-tightened on one side can crush and leak on the other, so go slowly. If you are not sure which gasket your equipment uses, compare the dimensions and shape to the original before you order, and confirm compatibility with your boiler.
Key Benefits
- 5.25 In. by 10.00 In. Size: The exact dimensions are part of the 590-317-550 catalog listing.
- Flat Plate Gasket: A flat gasket for sealing a heater plate to its mating surface.
- Distinct From the 590-317-579: Each number is a different gasket, so match by shape and dimensions.
- Genuine Weil-McLain Number: Order by the Weil-McLain number on your original gasket.
Common Questions
- What size is the 590-317-550? 5.25 in. by 10.00 in., as listed in the catalog designation.
- Is it the same as the 590-317-579? They are different numbers. The 590-317-579 is catalogued as a gasket for a heater cover plate. Compare dimensions and shape to your original.
- Should I replace the gasket every time? Yes. Replace the gasket whenever the plate is removed, and tighten the nuts evenly in a cross pattern.