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- A double oil seal, also known as a tandem seal or a dual seal, consists of two sealing elements placed in series. This design offers a two-layered defense against contamination ingress and fluid egress, thereby enhancing the overall sealing performance. The primary seal acts as the first line of defense, while the secondary seal serves as a backup, providing redundancy in case the primary seal fails.
Type Preparing to replace the sump gasket
- E3 Diamond Fire Spark Plugs Igniting Performance and Efficiency
Installation of Seal over Splines

ssr 125 spark plug.
How does an Oil Seal Work

B