True Metric Tubing for Metric Barbed Fittings and European-Built Equipment This metric 51 mm kink free pond tubing comes as a 50 ft (15.2 m) roll of flexible black tubing for high-flow, metric-plumbed waterfall, stream, and filtration systems. It is sized for true metric 51 mm barbed fittings and hose tails, the large-bore connection used on many European-built pumps and gravity filters. The smooth interior minimizes friction loss at flows where smaller tubing would choke a pump, and the heavy ribbed exterior keeps the line round under rock loads. Metric Sizing Matters for a Leak-Free Seal Big tubing moves a lot of water, so a marginal fit at the pump discharge leaks noticeably rather than slowly. This metric version matches 51 mm tails properly, keeping the joint tight where flow and vibration are highest. For systems built on standard North American 2" barbed fittings, use our standard 2" kink free hose instead. EasyPro supplies this size in 50 ft rolls, rated from -26°C to 88°C (-15°F to 190°F), buried or exposed. Inside Diameter 51 mm metric (nominal 2") Length 50 ft (15.2 m) Colour Black Fits 51 mm metric barbed fittings and hose tails Construction Smooth interior for maximum flow, ribbed exterior for crush resistance Temperature Range -26°C to 88°C (-15°F to 190°F) Suggested Max Pump Flow 4,800 GPH (18,170 LPH) MPN MNK20B How to Use Cut the tubing squarely and soften the end in hot water before working it fully over the 51 mm barbed fitting. Clamp every joint with stainless steel hose clamps, doubled up on the pump discharge. Support long vertical sections so the weight of the water column is not carried by the fittings. Ideal for high-flow, metric-plumbed waterfalls, streams, and filtration systems running pumps up to about 4,800 GPH (18,170 LPH).
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