can be removed ball 52 may seat against opening 56 in such a case the gas outlet 27 is closed with the result that the pressure within container 10 can increase rapidly thereby forcing liquid out through overflow outlet 26 normally oil is removed via oil drain outlet 25 via tubular space 65 comprised of wall 66 which is affixed to side wall 13 the lower opening 67 into space 65 is located a a sufficient distance above any level of solids that may collect against bottom wall 12 oil exits through oil drain outlet 25 when lower spool valve body 59 having disks 63 and 63a is lifted via rod 60 and handle 64 when handle 64 sealed with packing 61 is lifted vertically by an operator the upper gas isolation disk 58a will shut off gas outlet 27 causing a pressure increase in container 10 with the result of forcing oil out through oil drain outlet 25 the size of lower spool valve body 59 is chosen to prevent a complete closure of airbox inlet passageway 31 when the spool valve assembly 58 is operated in many small engines the crankcase is pressurized to assist in the venting of dangerous explosive vapors and second exhaust inlet 24 from the crankcase is used crankcase exhaust enters inlet chamber 32 and is directed into a passageway 33 having a check valve 69 biased normally closed against seat 72 the spring 71 and stem 73 is secured against spring base 70 in a conventional.