Single mechanical seal with open spring R-BIA is used at temperatures from -40 to + 120°C, with pressure up to 1.5 MPa and rotation speed up to 13 m/s. Analogue of Burgmann BIA seals. Mechanical seal for Wilo, K, KM, X, AX, AXP, AX, Calpeda, DAB, Ebara, Grundfos pump, for KSB pump, Allweiler, SALMSON, ACD Cryo, Flygt, IMP Pumps, LOWARA, PENTAX, Foras, Fristam, for SPERONI pump, ZENIT, Inoxpa, JL, Johnson pump, KOLMEKS, Pedrollo, SAER, Vulcan, WQ, WQK, for Tuchenhagen pump, ALFA LAVAL, Donjoy, Mission Magnum.