Self Contained Kegs

Any information appreciated about the use, cleaning, and CO2 charging for old Hamm's 2-1/8 gallon aluminum tanks. These tanks have an integral CO2 cylinder/regulator inside the removable rear cap. The assembly is held together with a large snap ring. It appears they may have been cleaned without disassembly and one of the holes on the CO2 dispenses was used to recharge the cylinder. I have 4 in good condition and also have a decent condition Styrofoam ice holder with same Hamm's logo's on the outside. Thanks! Rick contain information that is privileged, confidential and/or exempt from disclosure under trade secret and other applicable law. If you are not the intended recipient, notify the sender immediately, permanently delete all copies of this Message, and be aware that examination, use, dissemination, duplication or disclosure of this Message is strictly prohibited.