For example: bar copper, Auto leather covered piece, covered yarn, snap lock, seam cleat, air curtain shell, refrigerator shell.

A piston and scraper assembly (26) for a high-pressure liquid chromatography column (1) is provided with a snap lock between the piston (5) and the scraper (25).

Maxium user security through snap-lock functionality & red-colour indications for open and closed position.