FOR MERCURY 3.0L Lower Units 1.75:1, 20" Driveshaft

Compatible Replacement for Most Mercury 3.0L Lower Units (SN 1B504989 and Below)
Not compatible with Torque Master, Torque Master 2, or Sport Master models.

Features a 13-spline, one-piece driveshaft.

Note for 8-Spline Driveshafts:
If your current unit uses an 8-spline driveshaft, you’ll need to purchase the stub shaft version and obtain the correct upper driveshaft from an authorized Mercury dealer.
OEM Reference: 20" – Part #45-824114A 1

Water Tube Coupling Info:
SEI 216 gearcases include the appropriate water tube coupling for serial numbers OG438000 and newer. For earlier models, reuse your existing coupling or purchase the correct one separately (SEI part #SM-96-116-12K).