Waterway Thru-Wall Thermowell Thermosensor With Probe Protector [3/8" ID] (400-4380)

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The Waterway Thru-Wall Thermowell Thermosensor With Probe Protector [3/8" ID] (400-4380) is a heater-related replacement component used when servicing spa or pool heating systems. It supports proper assembly around heater plumbing, sensing, thermostat, manifold, or housing areas depending on the original application.This Waterway Plastics part should be chosen by exact part number and application details because heater components often depend on precise dimensions, sensor placement, or connection geometry. Key identifiers include 3/8" ID. Notable sizing references include 3/8". Using the correct replacement helps maintain the original service layout and can reduce downtime during heater repair. It is intended for qualified service work where the existing component is cracked, worn, leaking, missing, or no longer securing the heater assembly as designed. Before ordering, compare the listed specifications against the existing component and inspect the surrounding plumbing for wear, cracking, or damaged threads. Part number 400-4380 should be used as the primary identifier when cross-checking compatibility. Intended for compatible pool or spa heater service applications Match exact part number, dimensions, and equipment model before purchase Useful for repairing worn, leaking, or damaged heater assemblies Supports proper alignment around heater plumbing or control areas Recommended for installation by a qualified pool or spa service technician Show more