see: sirni
The verb sara’ “to sieve” forms the instrumental noun sara’an through productive -an suffixation.
The fishing implement sarap appears to be a lexicalized stem.
There is no evidence for a productive morphophonemic alternation of final glottal stop to -p in Boie’nen.
The fishing lexeme family (sinarap, parasarap, sasarapan) is derived from the stem sarap.