Base flange for square tube - Cast stainless steel 4" cast stainless steel base flange for 1 1/2" square tube. Weld on type. 316 SS. Product Engineering Medium DutyHeavy DutyMedium DutySize Medium Duty - $36.13 CAD Heavy Duty - $37.13 CAD Add to cart BF003 Share this 12 ← →