Draper expert 7 piece petrol engine compression test kit draper expert 43051 b i expert quality i b allows the compression of petrol engines to be tested whilst running large easy to read scale measuring 0 290psi 0 20bar with 370mm of flexible hose and push on adaptor incorporating a schrader one way valve side pressure relief valve allows rapid retesting display packed in blow mould storage case with sleeve draper expert 43051 7 piece petrol engine compression test kit