Wesfil Cooper Water Separators: Wesfil has been a part of the Australian automotive aftermarket commencing in 1984 when manufacturing began in Western Australia. Within the pursuant years, Wesfil has continued to expand and thrive in a market that continues to demand quality, range and good old fashioned customer service. Wesfil Australia Pty Ltd sources its air, oil and fuel filters from quality assured suppliers who manufacture to meet the performance requirements appropriate to the application.