pd4dResponding to a PD4R notice. You must respond to the PD4R notice and provide an explanation, even if a request has been made to correct the discrepancy.. The response can be sent using:PD1 PD3 PD4 ED1 ED6 ED4 ED5 GD30 PD3D PD4D. If. 3. DTE. 8. 9. 10. P. D600002. E. DTE PD4D. > DETACHABLE HANDPIECE. WITH LHT. Better visibility. Handpiece