The Hercules SR-74 adjustable air flow washer is the latest and greatest addition that will make your SR perform like no other. The theory behind it is to reduce the oxygen going into your lungs to fill it with vapor produced from the heater. Be careful as soon as you reduce the air flow the heater will run hotter.
No warranty is given other than dead on arrival. This must be reported within 24 hours of receipt. Proof of purchase is required.