Delavan O-ring seal 31351-003

Delavan O-ring seal 31351-003 is a replacement seal used in oil burner systems. It is categorized under oil filters, coils, tubes, and hoses. The seal is designed to create a leak-tight joint between mating surfaces, such as at the oil filter housing, pump flange, solenoid valve body, or tube connections. No further specifications are provided for this particular seal.

When selecting a replacement seal of this type, ensure the material is compatible with heating oil and can withstand the temperature and pressure in the fuel line. The cross-section diameter and inside diameter must match the groove dimensions exactly; even a small mismatch can prevent proper compression. Always compare the removed seal with the replacement before installation.

A worn or deteriorated seal allows air ingress or oil leakage, which can cause erratic pressure, nozzle drip, or burner lockout. If the original seal is hardened, cracked, or deformed, address the underlying cause, such as heat from a preheater or overtightening, to avoid recurrence.