Fleck J-Tube 3/8" O.D. gray pipe by 34" Long.
Can be cut down to fit your salt tank ( with Air Check portion touching or very close to the Bottom of the brine tank ).
Old p.n. 3460002, now FP60002.
Requires 3/8 x 3/8 elbow - 58506NO, or JF506NSG listed as Related Products ( see below ).
This is just a plain pick up tube with air check at bottom.
Often used with Safety Shut Off that includes the Elbow Connection, see: Brine Safety Shut Off Valve 3/8" 2310 ( 60014 )
NOTE: This Pick Up Tube can be used with or without a "Brine Well", when no float shut off attached.
It's very common to just stick this down into the Salt.
NOTE: While RARE in Residential Brine Tanks, there is another similar but slightly larger version ( 1/2" O.D. gray pipe ).
Reference = BPH4500
AIR in the LINES after Regeneration can be this part needing to be cleaned or replaced.
See Article on the subject - Air in water lines after Softener Regenerates