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The Tri-Clover Thermowell Port 4mm is suitable for quick and easy installation or removal of temperature probes into Boilers, Distillers, etc.
When tightening the Nut, the sheath closes around the probe creating a watertight seal.
Inner Diameter: 4mm - Accommodates a 4mm Probe.
Tri-Clover Size: 50.5mm = 1.5"