Ostra Plumbing Supplies Home ›› Local Listings ›› NSW ›› Seven Hills ›› Ostra Plumbing Supplies NSW Business Services Seven Hills, NSW 2147 Robert Bristow(02) 9624 1000https://www.ostra.com.au Ostra Plumbing Supplies is a plumbing supply store based in Seven Hills, NSW. We provide high quality, cost effective bathroom supplies and bathroom renovation supplies.