This is a 3-1/4" dia. can reservoir with a 5/8" od hose barb outlet, 1/8"npt curtis drain valve on bottom of can, and a fire wall mounting bracket.
It keeps oil in can and off belly of airplane then can be drained later with petcock. Helps to keep crank case condensation to a minimum. Recommended for experimental aircraft use only not STC’d for certified aircraft.
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Can material is steel. The can cannot be disassembled. To clean the can take off of the fire wall and flush with solvent and open petcock and drain. Allow three hours for drying. Install back in place.
Overall height is 5-1/2"
It would vent air out of the top it the engine compartment, but oil would be held in the can until drained.