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Just picked up an old Hot Springs that was in perfect running condition. During transport the insulation around the heater crumbled. Anyone know if they used asbestos and what material to replace it with or does it need to be replaced? Can it sit on a firebrick? Thanks for the help

Does anyone know if that insulating material around the heating element is asbestos? I just picked up a 1986 Hot spring with a similar element and the refractory crumbled off. Also, is there a good replacement for the insulation? Thinking just fireproof insulation. Thanks for the help