Water cooled beam tube length 20 mm
https://indus.ms-engi.com/shop/p-10034-water-cooled-beam-tube-length-20-mm-114
https://indus.ms-engi.com/web/image/product.template/114/image_1920?unique=02f18e4
Water cooled beam tube with below - diam.: 50 mm - length: 20 mm
