Nothing in my Owner's Manual, except limiting air pressure to 30psi or less for the entire blowout process. Nothing in the Truma water heater manual, either.
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2018 (2017 Sprinter Cab Chassis) Navion24V + 2016 Wrangler JKU (sold @ ????) - 2016 Sunstar 26HE (sold @ 4600 miles) - 2002 Roadtrek C190P (sold @ 315,000kms)
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