Harris D-50-C Tip Tube Mig Welding Guns The 51 regulator adaptor is

The 51 regulator adaptor is designed to adapt a commercial acetylene regulator with CGA 300 to a POL acetylene tank with CGA 510

It is a right hand female to "A" size right hand female

It has a single standard B-size (9/16-18) female inlet fitting for your regulator outlet and 2 male B-size outlets for twin welding hose

Oxygen Low Pressure: 2 x 200 dual scale

For use with

Harris D-50-C Tip Tube Mig Welding Guns The 51 regulator adaptor isSmall elbow tip tube that fits the B 15 3, H 16 E & H 16S mixers. Designed to fit 1390 & 1390N welding tips & 1390H & 1390B heating tips. Threading at the base of the D 50 C welding tip tube is 5 16" 27.