Most modern plumbing is done with copper or plastic pipe. Older buildings were plumbed with galvanized pipe. If copper pipe is used to install equipment in a building having galvanized pipe, be certain to use an approved insulating connector made of nonconducting material at every point where the dissimilar metals will be joined. Nonconducting connectors will reduce the possibility of galvanic corrosion. Since it is common practice to use water lines as safety grounds for the electric wiring system, these insulating connectors should not be used in main water lines unless a grounding strap is used to maintain the existing electrical grounding.

When a lubricant is required for fittings or 0-Rings, be sure to use the correct substance. Some washers need a petroleum based lubricant, while many 0-Rings require a silicone based lubricant. Consult the manufacturer's instructions.

All lubricants, flux, solder, and other matenals used for installation purposes must be suitable for use with potable water (i.e., water safe for human consumption). Solder should be lead free. New federal regulations now require lead free solder. Never use any rnaterial in the installation that can add a toxic substance to the effluent water. Always use sufficient materials to do a proper job; but do not use excessive amounts of flux, solder, or lubricant that may end up in your water.