These masks are equipped with a standard thread connector EN 148-1 and as such they can be used with all devices provided with the same connector (gas and particle filters, negative pressure BA, air line etc.). ST 85 is professional and durable half mask. It is ideal for chemical and pharmaceutical companies, agriculture and mining industry. TR 82 and TR 2002 are masks with wide visibility visor and speech device. These masks are available in TPE, EPDM or Silicone.