Gast AF521 Cylinder Gasket 56 Frame Piston Pump

Product Description

The GAST AF521 is a cylinder gasket designed as a direct replacement component for Gast 56 Frame piston pump air compressors. This gasket seals the cylinder assembly, preventing air leakage between mating surfaces and maintaining compression integrity during pump operation. It is a single-piece accessory intended for service and maintenance applications. Technicians working on piston-type air compressors and vacuum pumps in industrial, HVAC, medical, and laboratory settings will find this part a standard consumable for scheduled rebuilds or leak repairs. The AF521 measures 3.31 inches in length and 3.31 inches in width, with a compressed thickness of 0.01 inches.

This cylinder gasket fits Gast 56 Frame piston pump assemblies used across a range of light-duty compressed air and vacuum applications. These pumps are commonly found in industrial equipment, pneumatic control systems, and OEM machinery requiring low-volume air delivery. The AF521 is typically replaced during cylinder head service, after any piston or valve repair, or whenever signs of compression loss or air bypass are present at the cylinder mating surface.

Key Features

• Cylinder gasket designed specifically for Gast 56 Frame piston pump platforms
• Compact flat-profile design at 0.01 inches compressed thickness for precise sealing
• 3.31 inches x 3.31 inches footprint matches 56 Frame cylinder bore dimensions
• Sold individually, allowing single-unit replacement without buying a full gasket kit
• Suitable for both compressed air and vacuum pump configurations in the 56 Frame series

Compatibility

Designed for use with Gast 56 Frame piston pumps. Verify the frame size and cylinder configuration of the specific pump model before installation to confirm fitment.

Installation Notes

Installation should be performed by a qualified technician familiar with piston pump disassembly and reassembly procedures. Depressurize and de-energize the pump fully before opening any cylinder or head hardware. Mating surfaces should be cleaned and inspected for scoring or corrosion before the new gasket is seated. Do not reuse a compressed or damaged gasket once removed.