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The Mishimoto Silicone GM LS V8 heater core bypass hose provides a clean, durable way to bypass the heater core during an LS swap or on LS-powered builds. Constructed from heat- and pressure-resistant five-layer silicone, it tapers from 3/4" to 5/8" to fit the water pump "in" and "out" ports. Bypassing instead of blocking preserves coolant flow for proper thermostat operation and helps prevent overheating. Backed by Mishimoto's Lifetime Warranty.
Mishimoto LS Heater Core Bypass Hose Black
