Exact replacement: 57-21-1 Carburetor Leak Detector for 705-020Upgraded Vision: Carburetor Pressure Gauge is both quality and measurement are upgraded. Measurement range: 0-200kpa(0-29psi). range and more accurate measurement.Excellent carburetor leak detector: Fit for 57-21 705-020, used to test whether and other 2 cycle carburetors for leaks, replaces PG-2, for Tillotson 243-504.Interchange Part Number:57-21/ 57-21-1/ 705-020Fitment:for Tillotson 243-504for ZPG-2for 705-020Please note:the physical slightly color difference or difference, does not affect the use, please do not mind, thank you!Colour:As ShownMaterial:MetalPackage Contents:1 set * Gauge Carburetor Leak DetectorOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.