Purchase Orders › HydraSUM - 4 L x 4 Image 1 of 1 HydraSUM - 4 L x 4 $1,000.00 Multi-purpose hydraulic fluid supplement in a 4 Litre jug. Comes in a case of 4 jugs. Quantity: Order Added! Multi-purpose hydraulic fluid supplement in a 4 Litre jug. Comes in a case of 4 jugs.