บ่อกราวด์คอนกรีต (Earth Pit)
Concrete earth pit with removable cover, buried over the ground rod of an earthing system for inspection.
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บ่อพักพร้อมฝาคอนกรีต ขนาด 30 cm.
Concrete handhole for electrical and cable work, with a square concrete cover and frame. Strong; custom sizes available.
หมอนรองท่อสำเร็จรูป CPS
Precast concrete pipe supports for 60–150 cm pipes — no lean concrete needed, just place them; prevents pipes from rolling. 2 per pipe.
