Dow silastic supply quality Foley catheters. The Dow silastic catheter is a 2way catheter and is available in different sizes and capacities. Dow silastic have a smooth, silicone exterior coating that helps reduce calcification build-up from developing. Browse Dow silastic catheter products with Independence Australia because when you buy medical supplies and personal healthcare products from Independence Australia, you help enhance the lives of people living with a disability or personal need. Shop online now for free, fast delivery purchases over $50.