Spare discs and removal tool for your electric wall fire. Optimum position for transducer in the water is 5cm. x Transducer. Made of material, and practical to use. BBK20(Series A- D)' BBK20(Series for E)' BRG20(Series A)' DNV20CH(Series A- Onward)' DNV20AB(Series A- for C)' DNV20BL(Series A- for Onwards)' DNV20BR(Series A- for C)' MFD20(Series A)' OKT20(Series A)' RDY20(Series A- D)' RDY20(Series for E)' SCR20(Series A)' SCR20(Series for K)' TAH20(Series A)' TAH20(Series for E)' WBK20(Series A)' WMR20(Series A)' ALM20(Series A)' AUB20(Series A)' CAS600' CAS400NHLL' CAS400HLL' CAS600NH' RTOPC 0' RTOPW20' RTOPI20BR' RTOPI20CH' SVT20(Series A).