This multi-stage regulator has a 1 x 10-8 cc/sec inboard helium leak rate to maintain gas purity levels for applications with non-corrosive high purity gases. The 111/16" 316L stainless steel diaphragm eliminates contamination from diffusion or outgassing. The one-piece encapsulated design surrounds the seat with a sintered filter to protect the seat from contamination. It features 2" brass dual scale gauges with a brass bonnet, body, 1/4" needle valve and and fittings. Includes barbed adapter for 1/4" ID flexible tubing.