The best oil burner flange gasket depends on the burner tube diameter, flange dimensions, bolt pattern, and gasket thickness. The Lynn Manufacturing gasket is a strong match for buyers seeking a 1/8-inch-thick universal option with adjustable punch-out holes. The Irnyso and ZFZMZ gaskets suit buyers who need a specified 3-bolt, 6 5/16-inch-square pattern, while the JFYO option supports either 3- or 4-bolt patterns. RURBRIN offers a two-pack of a universal-style gasket. Compare the stated measurements with the existing assembly before choosing.
| Product | Best for | Key stated detail |
|---|---|---|
| Lynn Manufacturing 9550 | Universal fit and stated material thickness | About 4-inch tube; 1/8 inch thick |
| Irnyso 3-Bolt, 2-Pack | Specified 3-bolt flange dimensions | 6 5/16-inch square; 1/16 inch thick |
| ZFZMZ 3-Bolt, 2-Pack | Beckett-style 3-bolt pattern | 6 5/16-inch square; 4-inch tube |
| JFYO Universal, 2-Pack | Choosing between 3- and 4-bolt patterns | 8 1/2-inch outer diameter; 4-inch inner diameter |
| RURBRIN 9550X, 2-Pack | Universal-style fit with adjustable holes | About 4-inch tube; multiple bolt patterns |
Lynn Manufacturing 9550 Universal Gasket
Best for: Buyers looking for a universal-style gasket with a stated heat-rated material and adjustable bolt-hole locations. It is listed for burners with approximately 4-inch-diameter tubes and replaces Beckett 3616 and other gaskets.
The gasket is made from 1/8-inch-thick Manniglas material rated to 1200°F, according to the product details. Its punch-out holes can be adjusted to accommodate a range of bolt patterns. Listed compatible burner models include Beckett AF, AFG, SR, SF, CF375, CF500, CF800, and NX.
Why it was selected: The listing provides useful fit information, including tube diameter, thickness, material, and named burner models. That makes it easier to compare against an existing gasket than a listing with fewer specifications.
Check before buying: “Universal” does not replace measuring the actual flange. Confirm the tube diameter and bolt pattern, and check whether the 1/8-inch thickness matches the application.
Irnyso 3-Bolt Flange Gasket, Two-Pack
Best for: Buyers whose existing assembly matches the stated 3-bolt pattern, 6 5/16-inch-square dimensions, and 4-inch tube diameter. The product is supplied as a two-pack and is listed for Weil McLain boilers and many other applications.
The listed gasket thickness is 1/16 inch. The product details name Beckett, Wayne, Carlin, Aero, Ducane, York, and Trane among the burner brands it fits, in addition to Weil McLain boilers. These names are useful references, but the stated dimensions and flange pattern remain important when confirming fit.
Why it was selected: This option provides a defined size and bolt configuration rather than relying only on a broad universal-fit description. The two-pack may also suit a buyer who wants a spare on hand.
Check before buying: Choose another option if your flange is not a 3-bolt pattern or if its dimensions differ. The listing gives a 1/16-inch thickness, so compare that measurement with the existing gasket and installation requirements.
ZFZMZ Beckett 3-Bolt Gasket, Two-Pack
Best for: Buyers seeking a specifically described 3-bolt gasket for a Beckett or Weil McLain-related application, provided the measurements match. The listed dimensions are 6 5/16 inches square, a 4-inch tube diameter, and 1/16-inch thickness.
This product comes as a two-pack. Its specifications are more focused than a general universal gasket: the listing identifies the Beckett oil burner flange gasket application and names the 3-bolt pattern. That detail can help narrow the choice when the old gasket has the same configuration.
Why it was selected: The stated dimensions and bolt count make it a straightforward comparison candidate for buyers replacing a matching 3-bolt gasket. It may be a better fit than an adjustable universal design when the flange measurements align.
Check before buying: The listed fit description is narrower than the universal products in this group. Avoid choosing it based on brand name alone; confirm the square dimensions, tube diameter, bolt pattern, and thickness against the burner flange.
JFYO Universal 31653 and 3616 Gasket
Best for: Buyers who need a gasket designed for either a 3- or 4-bolt configuration. The listing identifies it as a replacement for oil burner flange gasket models 31653 and 3616 and includes two gaskets.
The stated dimensions are an 8 1/2-inch outer diameter, a 4-inch inner diameter, and 1/16-inch thickness. The dual-pattern description gives this option flexibility where the flange uses one of the listed bolt arrangements. Compare the outer and inner diameters with the old gasket as well as checking the bolt locations.
Why it was selected: Its 3- or 4-bolt design addresses a key fit difference that can rule out a fixed 3-bolt gasket. The product also states both inner and outer diameters and thickness, which supports a direct measurement check.
Check before buying: The listing does not provide the same named burner-model list as some alternatives. If your application depends on a specific burner model, verify the dimensions and pattern rather than assuming compatibility from the “universal” description.
RURBRIN 9550X Universal Gasket, Two-Pack
Best for: Buyers looking for a two-pack universal-style gasket for a burner with an approximately 4-inch tube and a bolt pattern that can be matched using punch-out holes.
The listing says the gaskets replace Beckett 3616 and other gaskets. It names Beckett AF, AFG, SR, SF, CF375, CF500, CF800, and NX as compatible models. The product description also says the holes can be adjusted to fit a variety of bolt patterns.
Why it was selected: It combines a stated approximate tube diameter, adjustable hole layout, named burner models, and a two-piece package. It is a practical comparison option for buyers who need flexibility in the bolt pattern.
Check before buying: The provided product details do not state the gasket material or thickness. If either measurement is important for matching the existing assembly, confirm that information before selecting this option.
Buying Guide: How to Choose an Oil Burner Flange Gasket
What measurements should you check first?
Start with the old gasket or the flange itself. Measure the burner tube opening, the gasket’s outer dimensions, its thickness, and the spacing and number of bolt holes. A listed 4-inch tube diameter is not the only fit requirement: the flange outline and bolt locations also need to align.
When possible, record measurements before removing the old gasket. If the old part is damaged or distorted, use the burner flange and manufacturer documentation as references rather than relying on the damaged gasket’s shape alone.
Should you choose a universal gasket or a fixed pattern?
A universal-style gasket may be useful when its adjustable punch-out holes can match the flange. The Lynn Manufacturing and RURBRIN products specifically describe adjustable holes and approximately 4-inch tube fit. Still, “universal” is not a guarantee that every burner will fit.
A gasket with a specified pattern, such as the Irnyso or ZFZMZ 3-bolt products, can be easier to assess when your existing flange has the same bolt count and dimensions. The JFYO gasket is described for either 3- or 4-bolt patterns, but its stated diameters and thickness should also be checked.
How important are thickness and material?
Thickness can affect how the gasket sits between the burner and flange. The listed options include products described as 1/16 inch thick and one Lynn Manufacturing gasket described as 1/8 inch thick. Do not treat these measurements as interchangeable; compare them with the part being replaced and the equipment’s requirements.
Only the Lynn Manufacturing listing in this selection states a material and temperature rating: 1/8-inch Manniglas material rated to 1200°F. The other product details provided here do not specify material or a temperature rating. If those details matter to your selection, check the complete product information or consult the burner documentation.
Does the package quantity matter?
Several listings specify two gaskets, which may be useful if you want a spare. The Lynn Manufacturing listing describes one replacement gasket. Package size does not determine whether a gasket fits, so confirm the dimensions and pattern first.
What if the burner model is listed?
Named model compatibility can help narrow your search, especially for the Lynn Manufacturing and RURBRIN products, which list several Beckett models. Treat the model list as a starting point, then confirm the tube diameter and flange arrangement. A model name by itself does not show whether a particular installation has matching dimensions.
If the model or measurements are unclear, use the burner’s documentation or ask a qualified heating professional to identify the correct replacement. Oil burner service involves equipment that must be assembled correctly; do not force a gasket that does not line up with the flange.
Frequently Asked Questions
What does an oil burner flange gasket do?
It sits between the burner mounting flange and the mating surface to form a seal. The replacement needs to match the opening, flange dimensions, bolt pattern, and required thickness.
Are all 4-inch oil burner flange gaskets interchangeable?
No. A 4-inch tube measurement does not confirm that the outer dimensions, bolt pattern, or thickness will match. Check all stated measurements before choosing.
How do I identify a 3-bolt versus 4-bolt gasket?
Count the mounting holes on the existing flange or gasket and compare their locations with the product description. A product described for multiple patterns still needs to match the flange’s actual hole positions.
Which option lists a material and temperature rating?
The Lynn Manufacturing 9550 listing specifies 1/8-inch-thick Manniglas material rated to 1200°F. The provided details for the other selected products do not state a material or temperature rating.
Can I use the burner model name alone to select a gasket?
Use the model name as a compatibility clue, not as the only check. Confirm tube diameter, gasket dimensions, bolt pattern, and thickness against the specific assembly.
What should I do if the measurements do not match?
Do not assume the gasket will fit. Recheck the measurements and consult the burner documentation or a qualified heating professional to identify the correct replacement.