Quality stainless bolt machined for generic board pressure valves.
No need for screwdriver. A coin is recommended to prevent 0-Ring and plastic thread damage from over-tightening.
Machined recess to protect washer from metal thread. Thread machined so excess air can escape with just a few turns.
Material: inox AISI316 (A4 Marine Grade).
Rubber ring not included.
Made in Greece