Click to expand Tap to zoom Hale Gauge Test Plug by Hale Sale Original price $27.60 Current price $24.00 | / SKU 200056893 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart The Hale Gauge Test Plug is nickel-plated brass with a 1/4” NPT front port and 1/8” NPT back port.