Here is a Barber Colman AP-302 & 1126 Fitting Kit Velocity Probe Assembly by Siebe/Barber Colman.  It is NEW and Original OEM. It is a Dust Static Pressure Sensing Tip. Measures 4″L x 2-1/2″W, mounting hardware provided. Brass, 1/4″ for plastic or copper end fitting.   
May be used with:
Air Handler 2
P323 Series
PC-301
PF-300 Series
PP-1012
PP-3013
PP-3113
PP-8121
PP-8516
PP-8616
PP-8621
PKS-323
R435
R436
VER-PxP

Ref- 600-37.