Allen 20mm XHL Extreme High Load Block Impellers while a tube runs down

while a tube runs down and connects to a plastic bell which sits in the water

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Manufacturer Part Number: 5189-BSS

Allen 20mm XHL Extreme High Load Block Impellers while a tube runs down20mm XHL Extreme high load block. Allen Brothers set a new standard for extreme performance with the AL 2030 XHL and the sailing world loved it. So they have extended the range and the new AL 2020 XHL features the same, best in class maximum working load and smooth action, but in a smaller, lighter package suitable for extreme applications on a smaller race boats. The XHL is a new 20mm block with CNC machined, anodised aluminium cheeks, with a