A full range of butt weld equal tees to the ASME B16.9:2018 standard (previously BS 1640) is available to order here on our website, these seamless fittings are available from stock in sizes between 3/4" x 1/2" and 24" x 20". All of these ASME B16.9 reducing tees are standard weight which in sizes up to 10" has the same wall thickness as Sch40, they've been manufactured from black (self-colour) ASTM A234 WPB carbon steel and can be supplied with 3.1 test certification if required.