52040009 GP Ceramic Plunger 15mm x 38mm EZ3040. General Pump / Interpump part 52040009 Ceramic Plunger for TX1510G8, EZ3030G34,EZ3035G,EZ3040G,EZ3045G and EZ2545G Pumps. 3 required for complete replacement. Diameter Size: 15mm. JN Equipment stocks the largest selection of General Pump Parts and Accessories in the U.S.A. Plunger Specs: 15mm x 38mm.