What size hole saw should be used for a 3" Uniseal?

4" hole saw. The link below has a chart for the various sizes. http://www.unisealshop.com/page.cfm?page=3

What temperature can this withstand, I am considering this for an automotive application and was wondering if it can handle engine bay heat

I used this product for pond plumbing. I don't think this can handle the amount of heat.

Will this work on a 55 gallon plastic drum? (Round side?) Thanks

Yes. It works well when executed correctly.. I have one in a huge tank twenty feet in the air. It has set for seven years and not leaked a drop. It has a four foot hole, and holds 3,000 gallions. Wish that this helps. Uniseal..

Manufacturer	Uniseal
Part number	U300
Item Weight	68 g
Product Dimensions	11.91 x 11.91 x 1.83 cm; 68.04 g
Item model number	U300
Colour	Black
Material	Alcryn
Item Package Quantity	1
Number of Pieces	1
Batteries included?	No
Batteries Required?	No

UNISEAL 3'' Flexible Tank Adapter (bulkhead)

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