A Click-on Super Clean TM Trap is designed to purify carrier gas and offers >99.9999 % purity. As a precaution, we highly recommend installing a moisture trap before hydrocarbon and oxygen traps in every carrier gas line. Spring loaded check valves seal when a filter is removed and open only when a new filter has been locked in place. There is no need for loosening and tightening fittings every time a trap is changed and your system will not become contaminated during the process.