4242 Butt Connector Wire Gauge: 12-10 Pkg. Qty.: 100

Wire Gauge: 12–10 AWG Type: High‑Heat Butt Connector (solderless coupler) Temperature Rating: Withstands up to 900°F Material: Nickel‑plated steel alloy Package Qty: 100 Brand: Molex‑pattern Source: Product page in your active tab

This is the heavy‑gauge, high‑heat splice techs use when standard vinyl connectors would fail in furnace compartments.