Popanga zomverera zokhomeredwa ndi singano, ulusi wa conductive kapena zinthu zowongolera zimasakanizidwa kukhala ulusi wamankhwala.Nsalu zosefera zimakulungidwa ndikuphatikizidwa ndi PTFE (wothandizira madzi), omwe amagwiritsidwa ntchito nthawi zina ndi chinyezi chambiri. Zosefera sizosavuta kutsekereza thumba la phala, moyo wautumiki wa thumba la nsalu umatalika, kuchuluka kwa gasi kumatuluka. ikuwonjezeka, ndipo mtengo wokonza umapulumutsidwa kwambiri.