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The Slip-On Flange Has A Low Hub Because The Pipe Slips
Into The Flange Prior To Welding. It Is Welded Both Inside
And Out To Provide Sufficient Strength And Prevent Leakage.
Slip On Flanges Are All Bored Slightly Larger Than The O. D. Of
The Matching Pipe. They Are Preferred Over Welding Neck
Flanges By Many Users Due To Their Lower Initial Cost, But
Final Installation Cost Is Probably Not Much Less Than That Of
The Welding Neck Flange Because Of The Additional Welding
Involved