The SharkBite PEX Poly Alloy Fittings range is an advanced plumbing solution when corrosion may effect DZR Brass products. Fittings should be wrapped with an impervious material, chloride-free tape or tightly wrapped and sealed insulation works well to prevent direct contact with the backfill. Backfill should be free of rocks, debris or any sharp objects that may cause damage through impact or abrasion.