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Will it fit: Each tank fitting has a 2in BSP male thread, 59.6mm across, so it needs a hole of about 61mm, low down in a smooth, flat part of the butt wall. You need to reach inside the butt to fit the back nut. Not for 3/4in, 1in or 1.5in holes What is in the kit: 5m of 50mm bore corrugated PVC hose, two straight tank fittings (2in BSP male thread to 2in hose barb), two washers and two back nuts. Hose clips and a drill bit are not included How does it fit: Push each fitting through the tank wall, add the washer and tighten the back nut on the inside, then push the hose over the barbs. A hose clip (not included) adds grip Can I cut the hose: Yes. The ribbed PVC hose cuts to length, bends around corners and is UV resistant, which helps limit algae growth inside Which size do I need: Choose this 2in kit for 50mm hose or an existing 2in BSP outlet. For narrower hose, our 1.5in kit uses 40mm hose, and our 1in kit 25mm hose and a 34mm hole