This End Cap/Gland fits for Mercury Marine V6 Units Gen 2 & 3 1991-2017 135 150 175 200 225 250 300 HP Verado Optimax EFI Carb. Does NOT fit L6 Verado!! Replace for 878239, 878239A1, 878239A02. Replace for 878239, 878239A1, 878239A02. This cap is for the center, larger tilt cylinder on a Mercury Outboard. It is not for the two smaller trim cylinders on either side. Be careful you don’t mistake this with the side rams, not tilt/trim, only tilt cap. Material: It is made of high-grade aluminum alloy with black powder oxidation treatment on the surface, anti-corrosion, strong and durable. All End Caps/Glands are made from High-Quality Aircraft Grade Aluminum alloy Produced On Precision Computerized CNC Machines. All Aluminum Parts Are Hard Anodized Using A Military Grade Type 3 Hard Coat (The Same Coating Used On Military Style Weapons) & Fitted With Viton & Or High-Grade Urethane Seals Depending On The Applications Pressure / Sealing Requirements. Satisfaction Guarantee: 100% satisfaction guarantee. Please feel free to contact us if you have any questions about our product. Replace for 878239, 878239A1, 878239A02. Material: It is made of high-grade aluminum alloy with black powder oxidation treatment on the surface, anti-corrosion, strong and durable.