A7304-4 can be used to retrofit B1559 series steel liquid level gages to include the shut-off feature. Each gage requires 2 of the A7304-4 shut-off sub-assembly. In addition to the o-rings supplied with the original gage, the following must also be ordered:
A2699-27 Qty. 2 For use at the mounting thread A2699-4 Qty. 2 For use around the adjustment stem
This sub-assembly is not compatible with gages manufactured prior to 2017.
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