Sürgülü gilza ichki gilzani harakatga keltirish orqali moy trubkasi va halqasimon bo'shliq orasidagi kanalni yopish yoki ulash uchun ishlatiladi: ichki gilzaning teshigi sirg'aluvchi gilza tanasining kanaliga qaraganida, sirpanish gilzasi ochiq holatda bo'ladi; Ikkalasi chayqalganda, ular yopiladi.
OTIS BO 3.813 "Toymasin kalit asbobi (1 1/16" -10 ip, 1,750 "baliq ovlash diametri)
OTIS BO 2.813 "Toymasin kalit vositasi (OTIS BO 2.813" Sürgülü kalit vositasi)
OSMS BO 2.313 "Toymasin kalit vositasi
OTIS BO 1.875 "surma kaliti asbobi (15/16" -10 ip, 1.375 "baliq ovlash)
BDK SMS BO 2.813 "Tanlanadigan toymasin yengni almashtirish vositasi (15/16" -10 ip, 1,375 "baliq ovlash diametri)
