Will the product be safe on stainless steel double sink drain? Dishwasher and disposal connect to the drain.

The product is safe for the stainless double sink. I presume that you are asking about the connection where the dishwasher connects to the actual drain pipe. This connection should not be an issue either. We do not recommend that you use it in dishwashers for the simple fact that we cannot verify the types of seals that are in the appliance and if there might be any incompatibility. For applications like you are describing, we recommend that you use the product as instructed and run your dishwasher through a cycle once the blockage has been cleared. This will help to ensure that any residual product that might have inadvertently gone down the dishwasher drain line, is completely flushed out
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