The Socket Welding Flange Is Similar To A Slip-On Flange Except it Has A Bore And A Counter bore Dimension.
The Counter bore Is Slightly Larger Than The O.D. Of The Matching Pipe, Allow In The Pipe To Be Inserted Into The Flange Similar To A Slip-On Flange.
The Diameter Of The Smaller Bore Is The Same As The I.D. Of The Mat Ching Pipe.
 A Restriction Is Bult Into The Bottom Of The Bore Which Sets As a Shoulder For The Pipe To Rest On.
This Eliminates Any Restriction In Flow When Using A Socket Welding Flange