This gauge works on tanks with a 11/2" tapping that have an internal height of 42"-44"; thus what is considered a vertical tank. In my experience 275 and 330 vertical tanks have the same shape; except one is 60" long and one is 72", thus the same gauge can work in either tank.
I have used them on outdoor tanks. However, ultimately that depends on the code in your state. Typically that means a conversation with a specially trained member of the fire department that handles the storage of potentially hazardous materials. For example my state no longer allows combination gauges and alarms. They now enforce the UL80 rules. Which require a separate 2” fill, 2”vent, and 2” gauge.
i have 275 gallon tank i need to change all 3 of them vertical gauge , zinc plated steel slip on vent cap and black iron floor flarge now my question is do i need to put pipe extension to the vent cap to make it longer or i can put it just like that! thank you.
The replacement vial for the OEM gauge is SKU 202274801 And the replacement for a Scully gauge vial is SKU 202274806. If you put those numbers in the search block on Home Depot . Com the items will come up.