FAS604 seal sizes - All NBR 70 shore A:
Valve inner seal 4mmi/d x 2mm
Valve outer seals 7mmi/d x 1.5mm
Breech seal 7mmi/d x 1.5mm
Breech Block 17mmi/d x 2.5mm
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Piston seal 17mmi/d x 2.5mm