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Availability Of Spanner Wrench For Removing Black/Grey Water Tank Caps  

Updated 11/17/2025 | Published 12/05/2024

Question:

I’m looking for a spanner wrench to remove the cap on my black and gray tanks.

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Expert Reply:

Hello David, thanks for reaching out. While we do not carry a spanner wrench made specifically for this purpose, we have heard of folks using the FloTool GRIPTECH Adjustable Band Oil Filter Wrench # FT10620GT to remove the caps from black/grey water tanks. The Oil Filter Wrench # FT10620GT is for 2-3/4" to 4-1/4" diameter oil filters. So as long as your fitting is in that size range, it should work for you and make removing the caps a lot easier.

expert reply by:
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Jesse M
Jesse M. profile picture
Etrailer Expert

Jesse M.

11/17/2025

Hey David, how did the FloTool adjustable band wrench work for removing your black and gray tank caps? Your update could make it easier for the next person trying to find the right tool for that job.

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