3Seal

NOZZLE GUARD FILTERS FEATURE THE BEST SEALING in the industry, so there is no worry that filters will leak at the gasketed joint between the spin-on filter element and the filter mounting head. Nozzle Guard starts with a gasket manufactured from Underwriters Laboratories Inc (UL) approved material to specification JMLU2, so the sealing properties will not deteriorate with the passage of time and contact with the fuel oil. Then Nozzle Guard applies its exclusive Triple-Seal design. 1) When the spin-on filter element is turned onto the Nozzle Guard mounting head, the gasket makes contact with a raised "knife-edge" on the head. As the filter is further tightened, this knife-edge is forced into the gasket surface to effect the primary seal. 2) As the filter is further tightened, the knife-edge becomes fully imbedded in the gasket and the gasket makes contact with the secondary compression sealing surface. 3) The outside diameter of the gasket is surrounded by a lip on the sealing surface. When an elastomer is compressed it expands in all directions, but the constraining lip on the Nozzle Guard head prevents the gasket from growing in diameter, and ensures an improved seal at the gasket joint.

CANISTER-TYPE FILTERS use a thin, wide, larger diameter gasket which has a large surface area and hence requires a relatively large amount of force to compress it to effect a seal. In order to create this seal, excessive force may be applied to the headbolt. This excessive force can deform the canister and make successive sealing even more difficult. The large surface area and large sealing force can result in gaskets adhering to the head and canister, making the canister difficult to remove for service, and resulting in deformation of the canister which can cause oil leaks. The Nozzle Guard gasket is thicker and has less surface area, so requires less force to make a seal. Only 1/2 turn past first gasket contact is required to seal a Nozzle Guard spin-on filter. And the gaskets don't stick to the head so removal of the used Nozzle Guard is easy.

COMPETITIVE SPIN-ONS use a simple compression seal--squash the gasket against a flat sealing surface and hope for the best.

HOW EFFECTIVE IS NOZZLE GUARD'S TRIPLE-SEAL DESIGN? Tests demonstrate that competitive spin-on filters experience gasket failures at under 200 psi, at which point the gasket is blown out from between the spin-on and the mounting head. Nozzle Guard maintains its gasket seal to beyond 500 psi! Nozzle Guard is easy to install, and easy to remove because gaskets don't stick to the mounting head.

For the best gasket sealing, insist on Nozzle Guard with Triple-Seal gasketing!

DON'T SETTLE FOR LESS! USE ONLY NOZZLE GUARD FILTERS ON YOUR OIL BURNER.