Overview Reviews Product Description 1/8" NPT. AUTOMATIC VENT LIMITING DEVICE FOR 325-3, R & RS Product Videos Custom Field Product Reviews (No reviews yet) Write a Review Write a Review × Maxitrol Maxitrol 12A09 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name *Email *Review Subject *Comments