Our BSP threaded tank fittings are used on all rainwater ranks and stock watering troughs to provide a waterproof connection. They are standard with male threads and large locknuts with rubber washers. The brass ones have a reverse thread on the locknut and an internal thread the next size down. Below is the chart with the sizes and hole sizes.
| Hole size needed | The description on the fitting |
| 22mm hole | 15mm tank flange adaptor |
| 28mm hole | 20mm tank lange adaptor |
| 34mm hole | 25mm tank flange adaptor |
| 43mm hole | 32mm tank flange adaptor |
| 48mm hole | 40mm tank flange adaptor |
| 60mm hole | 50mm tank flange adaptor |
| 97mm hole | 75mm/80mm tank flange adaptor |
| 125mm hole | 100mm tank flange adaptor |