Overview Reviews Product Description Air Brake Chamber for M970 4 x 4 5,000 gallon refueler semi-trailer that is pulled by 5 ton 6 x 6's. New in box. Heavy-duty GI Issue. NSN# 2530-01-024-1057. Part No. CPR132375 Product Videos Custom Field Product Reviews (No reviews yet) Write a Review Write a Review × Air Brake Chamber Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name *Email *Review Subject *Comments