Jabsco 17938-0001-P Impeller replaces Volvo D12/D13/D16This Jabsco impeller is constructed from durable neoprene for a long working life. This water pump impeller comes with lubricant, 2 O-rings and instructions for easy installation.Replaces: Volvo; D12 3830663; D12 3830459; D13 3830459; D16 3830459; Specifications: Diameter: 3-3/4"; Width: 3-3/4"; Shaft Diameter: 1"; Drive Type: Spline Drive; Material: Neoprene; Blades: 12; Jabsco 17954-0001-P Impeller Installation Instructions Remove screws, endcover, and gasket; Remove old impeller using Jabsco removal tool; Remove any debris from pump chamber; Lubricate inside pump wall and grease; Insert replacement impeller into impeller bore with a twisting motion; Fit replacement gasket and endcover; Tighten endcover screws;