Breather caps in polyamide-based technopolymer with RAL 2004 orange colour and graphic symbol "valve" and black threaded connection, NBR synthetic rubber packing ring, sealing disc in technopolymer with O-ring in NBR synthetic rubber and stainless steel spring.They are suitable for all applications (gearmotors, variators or compressors) in which the internal pressure of the tank must not exceed a certain value (10 or 100 mb).