The BG802HAK P1 is a high altitude conversion kit for BG802(E High efficiency multi speed motor) models that are field converted to use propane. It works with all 70000 and 90000 input btu models of that series. It includes all needed parts for the following application.

It is designed for high altitude, propane (LP) applications ranging from 4501-7500 feet above sea level.

This kit includes: 

91W53 (Switch-Pressure .30/.60 WC) 2 stage high altitude pressure switch 

BG11K48 propane conversion kit (low pressure switches are included with all Blueridge LP conversion kits for additional piece of mind and to protect your investment)