Comprising of two gauges for positive/negative and main pressure testing on low-pressure delivery fuel circuit found on common rail systems. Compatible with 9.98mm button type connection system. Suitable for use with Model No's VS555 and VS552 for those systems not supported by 9.98mm button type connections. Can be connected in situ with fuel line for real time running pressure. Quickly identifies fuel related problems. Features & Benefits:Comprising of two gauges for positive/negative and main pressure testing on low-pressure delivery fuel circuit found on common rail systems.Compatible with 9.98mm button type connection system. Suitable for use with Model No's VS555 and VS552 for those systems not supported by 9.98mm button type connections.Can be connected in situ with fuel line for real time running pressure.Quickly identifies fuel related problems.Model No. VS550 Specifications: Model No VS550 Brand: Sealey Nett Weight: 0.68kg