A. Yes. SharkBite fittings are certified for use underground, in behind the wall applications, and as a manufactured joint without access panels. But as always, please consult local codes prior to installation. If using the fittings for underground applications, they should be wrapped with an impervious material, chloride-free tape, or tightly wrapped and sealed insulation 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.