Comparison : Item # 1317-12-147, 3/16" Tube O.D. (3/8-24 Thread) x 3/16" Tube O.D. (3/8-24 Thread) x 3/16" Tube O.D. (3/8-24 Thread) Towed Trailer Brake Tee Brass
Item # 1317-12-145, 3/16" Tube O.D. (1/2-20 Thread) x 3/16" Tube O.D. (3/8-24 Thread) x 3/16" Tube O.D. (1/2-20 Thread) Towed Trailer Brake Tee Brass
Item # 1317-12-148, 3/16" Tube O.D. (9/16-18 Thread) x 3/16" Tube O.D. (3/8-24 Thread) x 3/16" Tube O.D. (9/16-18 Thread) Towed Trailer Brake Tee Brass
Item # 1317-12-144, 3/16" Tube O.D. (9/16-20 Thread) x 3/16" Tube O.D. (3/8-24 Thread) x 3/16" Tube O.D. (9/16-20 Thread) Towed Trailer Brake Tee Brass
Item # 1317-12-146, 3/16" Tube O.D. (7/16-24 Thread) x 3/16" Tube O.D. (3/8-24) x 1/4 Tube O.D. (7/16-24 Thread) Towed Trailer Brake Tee Brass