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Oil line question

In the morning we are updating the oil filtration and doing boiler cleaning.
My oil tank is in a small add on building at ground level with a 1/2" line coming in and then going to the basement. Now it is plumbed with a shutoff at the tank, shutoff downstairs, filter, OSV, and T to the boilers.
We are adding a Garber to the mix.
Is the preferred string after the downstairs shutoff-- OSV, original filter as primary, Garber as secondary and then the T? i.e., move the OSV to be right after the shutoff?




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