Corrosion Inhibitor Plus 1650 is now being replaced with Molyamor 350 Corrosion Inhibitor by Central Boiler. 1 gallon treats 200 gal. of water. Recommended for all Central Boilers to neutralize water We cannot ship to P. O. Boxes , AK, or HI UPS ONLY treats ph and moly ASIN B00H53UVH2 Size 1 gal. Color Blue Item Weight 22.4 pounds Part Number 2900630 Manufacturer Central Boiler Item model number 1650XL Batteries Included No Batteries Required No Product Dimensions 13 x 7 x 13 inches Is Discontinued By Manufacturer No