There is a pressure value on the gauge. The maximum pressure is 1KG. If the pressure exceeds or is unstable, the guage can be broke. 4x synchronizers with fixed plates (vacuum). 34 PICT-3 Carburetor 113129031K 98-1289-B For Beetle 1600cc Air cooled Type 1.

Adapters Sizes 1: 1.96 in/ 5 cm
Adapters Sizes 2: 2.4 in/ 6 cm
Adapters Sizes 3: 3.9 in/ 10 cm
Adapters Sizes 4: 6.7 in/ 17 cm
Box Color: The color of the box is random
Brand: BFO
Bundle Listing: Yes
Length of Plate: 15.6 in/ 40 cm
Length of Rubber Pipe: 30 in/ 74 cm
Manufacturer Part Number: DSY0JP
Note: No Instruction included
Operation Cautions: check the description
Package Includes: 4x  synchronizers with fixed plates (vacuum), 4x  rubber pipes (8mm x 5mm x 750mm), 4x  extension tubes(3.9 x 52mm), 4x  extension tubes(3.9 x 122mm), 8x  tubes with conical type connectors( 8mm x 40mm), 4x  tubes 10mm x 53mm ( M6x0.75), 4x  tubes 10x60mm ( M6x1.0)
Type: Carburetor Synchronizer tool