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Interlocking construction allows to connect multiple PEX chairs is series, allowing to accommodate any size in-slab radiant heat project. Outlets are distanced 2.5" OC (On-Center) and feature a side receiver for #3 rebar or 3/8" ATR. Horizontal outlet is raised 1" from the floor (form), perfectly suited for 4" slabs. Can be installed (interlocked) with bottom outlet facing in either direction, so that PEX lines from adjacent rooms can be organized under and run vertically to the same manifold. Designed for use with corrugated PEX sleeve (550-S12C & 550-S12H).