PRODUCTS 4 Cylinder OPSO Upgrade Kit Previous0.75 (30") POL x POL Armoured Hose NextHeavy Duty Spanner 4 Cylinder OPSO Upgrade Kit 4 Cylinder OPSO Upgrade Kit £45.00 4 cylinder OPSO upgrade kit. Comes complete with 2 hoses and 'T' pieces, and made for use when upgrading from a 2 cylinder system to 4 cylinders. Quantity: BUY Facebook0 Twitter