This aftermarket oil seal is a cost-effective replacement for Briggs & Stratton part numbers 399781 and 399781S. It is designed for use on the PTO (Power Take-Off) side of Quantum series engines, helping to prevent oil leaks and maintain proper lubrication.
The seal fits a wide range of Briggs & Stratton vertical shaft engines, including models from the 97700, 99700, 12A800 through 129800 series, and selected Quantum engines such as 625E, 650E, 675EX, 700E, 750EX, and 775iS. It is commonly used in lawn mowers and outdoor power equipment powered by these engines.
Manufactured to industry standards, this seal features an inside diameter of 27 mm, outside diameter of 43 mm, and a width of 7.95 mm. It is made from durable rubber material to ensure a secure fit and long service life. Always confirm your engine model, type, and code before ordering to ensure compatibility.
Technical Specifications:
OEM / Aftermarket: Aftermarket
Replaces OEM: 399781, 399781S
Inside Diameter: 27 mm
Outside Diameter: 43 mm
Width: 7.95 mm
Compatible Engines: Briggs & Stratton Quantum series (PTO side)

• BRIGGS & STRATTON PARTS: 399781, 399781S
• BYNORM PARTS: 160-107
• GA PARTS: OIL5336
• JAKMAX PARTS: B1BR68, 399781S