Overview Reviews Product Description Connect your own gauges with specific pressure ranges to the 651 series, 652 series, and 653 series Filters and Regulators using optional gauge ports. Greenline Industrial Fitting Catalog New Greenline Industrial Fitting Catalog Product Videos Custom Field Product Reviews Write a Review Write a Review × Greenline 1/8 Female NPT Gauge Port Adapter for 651, 652 & 653 Series Filters & Regulators GP650-02 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *