A VISUAL PLUG INDICATOR OF ALUMINIUM WHICH INDICATES IF A VALVE IS IN AN OPEN OR CLOSED POSITION. IT IS USED TOGETHER WITH A VISUAL INDICATOR CAP (CAP IS NOT SUBJECT OF THIS BTI APPLICATION) AND THE PLUG AND CAP ARE SCREWED TOGETHER. THE PISTON OF THE VALVE PUSHES THE PLUG AND CAP UPWARDS WHICH IS THEN VISABLE AND INDICATES THAT THE VALVE IS OPEN. IT IS NOT AN ESSENTIAL PART OF THE VALVE. IT HAS A FLAT HEAD AND IS HOLLOW THROUGHOUT. IT IS THREADED INTERNALLY.

GENERAL INTERPRETATIVE RULES: 1 & 6 THE HARMONISED SYSTEM NOTES TO: SECTION XVI, NOTE 1 (g) & SECTION XVI GENERAL NOTE (I) (b), SECTION XV, NOTE 2 THE HARMONISED SYSTEM EXPLANATORY NOTES TO: HEADING: 7616