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his range of reliable, silent operating pumps are suitable for the very smallest of systems right through to much larger ones. They are adjustable so you can tailor the flow to meet the exact needs of your system. Their design makes them ideal for constant running systems like NFT as well as Flood & Drain and numerous other system types. The bigger pumps have a 19mm outlet, which you can reduce down with a short length of 19mm pipe and a 19-13mm reducer. PRICE MAY BE INCORRECT RING STORE BEFORE PURCHASE.