18mm to 18mm Fire Cut Down-Stem
|FS4-4||4inch||× Temporarily Out of Stock|
|FS4-5||5inch||✓ In Stock|
|FS4-6||6inch||× Temporarily Out of Stock|
|FS4-4.5||4.5inch||✓ In Stock|
|FS4-3.5||3.5inch||✓ In Stock|
Fire-cut down-stems provide the best and most reliable diffusion while preventing blockage by spent combusted materials.The many small holes are cut using a hydrogen torch, a difficult and complicated process. The ground joint is a heavy high quality fitting.