Stainless Steel Rust Resistant Soap Pump Dispenser Lid Adapters for Mason, Ball, Canning Jars (2 Pack, Regular Mouth) Two 430 Grade Stainless Steel Soap / Lotion Pump Adapter Lids for *Regular Mouth* Mason Jars (2 3/8" Internal Diameter). This product is only the lid adapters, not the soap pump itself. In the pictures we have them on regular mouth half pint, pint, and quart Ball jars. 430 grade stainless steel is rust resistant, but some users do experience corrosion. We also sell 304 grade stainless steel soap lids on Amazon, and those do not rust or corrode. We sell the soap pumps separately so you can choose which pump and which lid adapter you want. Most of the soap pump lid adapters sold elsewhere are made of tinplated steel, which rusts quickly and easily. Here at the Mason Jar Lifestyle we always try to source the highest quality items, and our lids are stainless steel! They are made of 430 grade stainless steel, which is resistant to corrosion and rust. However, even stainless steel can rust eventually if it is constantly wet.