Zero-Leak Gold® Plug O-ring Information

The O-ring specifications and shelf life for the most common O-ring materials are provided below. EPCO can provide any O-ring material that is commercially available.

Standard O-ring Options

Buna O-ring Specifications

Viton O-ring Specifications

Why are ZLG Plugs O-rings 70d and SAE 90d?

What about the O-ring sizes relationships - ZLG vs. SAE?

The old style O-ring only SAE port entry plug uses a hard 90 durometer O-ring because the O-ring acts very much like a gasket. During the installation of the plug the O-ring is forced into the taper of the port in an attempt to create the only seal. The cross sectional area of the O-ring is larger than the cross sectional area in which it is installed. During installation the O-ring maybe forced into the threads of port and plug where it can become nibbled. The O-ring may also be extruded from the spot faced area of the port where it can be damaged resulting in a leak path.

The Zero-Leak Gold Plug uses a softer 70 durometer O-ring so the O-ring can respond to the system pressure if the primary seal is compromised. The Zero-Leak Gold O-ring is smaller in cross sectional area than the cross sectional area in which it rests. Under pressure the O-ring acts as a semi-viscous fluid and moves into the leak path to create the second seal. The zero-Leak Gold O-ring is smaller than its SAE counterpart. All Zero-Leak Gold O-rings are standard metric size O-rings.

ZLG standard plugs are supplied with the O-ring installed. EPCO can provide any O-ring material that is commercially available:

Buna - Viton - EPDM - Flourosilicone - AFLAS

Expected Shelf Life

Contact us with any inquiries about specific O-ring materials for your Zero-Leak Gold Plug applications.