Overland Cruisers - An interesting mod on this 100 series injection pump. They are known for having loose plugs on the Spill Control Valve, but this is the first I have seen
UNION 1/4" SPILL VALVE (PU090116-KIT) | Parts 4 Cleaner
model aircraft: Fuel control system
Karcher Spill Valve | BuySpares
Official Karcher 4.591-040.0 Spill Valve – PartSelect.com