The is a polished brass hand pump that connects directly to the engine oil dipstick tube on many popular marine engines such as OMC and Mercruiser.• Screws onto threaded male 3/4" garden hose fitting on top of dipstick tube• Simple one-hand pumping• Complete with 2' of 1/2" ID drain hose Simple one-hand pumping Complete with 2' of 1/2" ID drain hose | Engine Oil Drain Pump