Morose Oil Accumulator #23901 on 2040-parts.com

I am forced to sell out because of health reasons This is a New Accumulator from Mororso but was a display piece so what you seein picture is all you get there is no hose or fittings and the original box is gone but do have instructions this usually sells for $200

 Moroso's Accumulator connects to the pressure side of an engine's oiling system. When the engine is running, oil pressure forces reserve oil into the accumulator & compresses the air ahead. If oil pressure should suddenly drop due to hard acceleration/braking or severe cornering, air pressure immediately sends oil to the main galleries. When danger passes & the pump is once again primed with oil, oil pressure forces oil back into the Accumulator to prepare for the next emergency. Moroso Accumulators can also manually pre-lube engines before start-up to prevent cold-start scuffing and premature bearing wear.