The core of this uncapping tank is a stainless steel sink; see post #5 for a photo link:
https://www.beesource.com/forums/show...tos-plans-info

This one also has a photo link in post $5:
https://www.beesource.com/forums/show...ncapping-frame

USDA plans for an uncapping tank:
https://beesource.com/build-it-yourse...ing-tank-usda/

Photo in post #4:
https://www.beesource.com/forums/show...Uncapping-Tank

Photo in post #6:
https://www.beesource.com/forums/show...uncapping-tank

https://www.beesource.com/forums/show...-uncapping-tub
https://www.beesource.com/forums/show...-uncapping-tub


Note: For those considering using plastic tubs and the issue of 'food grade', manufacturer Sterilite says all their products are 'food safe'. http://www.sterilite.com/general_info.html