, Connecting piece for wind-tight cavity wall boxes, For wind-tight through-wiring in box combinations, suitable for wind-tight cavity wall boxes: E2700HF, E3700HF, SP3700HF Material: PP suitable for: halogen-free, airtight HW boxes E2700HF, E3700HF, SP3700HF, BS3700, BS2500, BS3500, BS2700
