The Outdoor Wood Boiler Yearly Maintenance Kit has everything you will need to Tune Up your Wood Boiler. The Yearly Maintenance Kit Includes: Fire Rope- 9 ft of Fiberglass Braided Rope- 1 10oz tube of Professional RTV Black Silicone for holding the 1" Fire Rope in and the extra for sealing around Chimney and any other areas that need it & One gallon of ProTech 300 can treat approximately 300 gallons of boiler fill water with a yield of +/- 1500 ppm nitrite. Provides boiler corrosion protection- rust inhibitor. It's recommended that all these parts be replaced yearly!!! This will greatly prolong the life of your Wood Boiler and make it run like the day you bought it. You should drain all the water and refill your Wood Boiler with fresh water also before adding the Boiler Treatment in. The whole job of replacing the maintenance parts should only take about 20 minutes. Easy Job... Be Self-Sufficient....