Abstract: A protective device is provided for couplers of hoses used in pumping concrete. The device includes two device halves configured to enclose the hose coupler and to secure together using a tool-free detent pin assembly having a shaft, spring-loaded ball bearings, and a manually operable extraction feature. Each device half includes a coupler channel to inhibit longitudinal movement and a sacrificial exterior layer over a wear indicator. The wear indicator may comprise a cellular or scaffold structure or a layer of contrasting color beneath the exterior surface. Visual exposure of the indicator signals the need for replacement. The protective device is configured to move with the hose during pumping operations, preventing abrasion damage to flooring surfaces caused by hardened concrete residue on couplers. The design supports low-cost fabrication, simplified replacement, and enhanced protection of finished floors in commercial and industrial environments.