The NABIC 542 spares kit contains a new diaphragm and 'O' rings which replaces all of the soft goods in the valve. The kit is suitable for all of the valves based around the 500 valve body i.e. 542F, 542L.
NABIC Fig 542 Safety Relief Valve Datasheet
NABIC Fig 542 Installation, Operating and Maintenance Instructions
NABIC Fig 542 Safety Relief Valve WRAS Certificate
Full NABIC Product Brochure
How to correctly identify your NABIC valve
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