Straight male adaptor 4 mm x 1/4" BSPP male thread

The same straight fitting, but with a parallel thread. That does not seal in the port; it seals on the O-ring pressed against the face around it. So you need a flat, clean landing surface.

The advantage is that you can undo it as often as you like without the seal getting worse. A tapered thread cuts itself in again every time and will leak eventually.

Specifications

• Tube outside diameter: 4 mm
• Thread size: 1/4"
• Thread type: parallel male thread with O-ring (BSPP / G)
• Material: engineering plastic with nickel-plated brass thread
• Working pressure: vacuum to 10 bar
• Temperature range: 0 to +60 °C
• Medium: compressed air and vacuum
• Series: CDC PC-G
• Manufacturer: CDC Pneumatics (South Korea)