Sierra 18-4218 Drain Tap for MerCruiser, Volvo, OMCSierra high-quality engine parts are designed to meet OEM specifications. Used with most OEM Manifolds.Features: Fits MerCruiser cylinder blocks & exhaust manifolds; Material: Brass; Size: 1/4" NPT; Interchangeable with: GLM; 13993; Johnson/Evinrude Outboard; 379957; Mallory; 9-41201; MerCruiser Stern Drive; 22-64426; 22-87238; 22-16951A1; 22-16951Q1; 22-16951T1; 22-16951T1; OMC Inboard; 379957; OMC Stern Drive; 379957; Volvo Penta; 82745;