Airgas Model E444D580 Stainless Steel High Purity Single Stage Positive Seal Regulator With 1/4" FNPT Connection shoptok The needle valve model has

The needle valve model has the valve built into the regulator body reducing the gas path

Velcro® closure over zipper

Nickel-plating keeps it looking good for a long time

Regulators are adjusted easily by removing the knurled nut and turning the screw to alter the tension on the diaphragm

Airgas Model E444D580 Stainless Steel High Purity Single Stage Positive Seal Regulator With 1/4" FNPT Connection shoptok The needle valve model hasThese single stage positive seal regulators feature convoluted, Hastelloy C 22 diaphragms that provide maximum sensitivity, minimum droop and a leak tight bonnet seal. Type 316 stainless steel internal components are ultra sonically cleaned and electropolished to a 32 Ra surface finish for applications where a contamination free flow stream is critical. Optional 15 Ra electropolished with faceseal. A rugged, mechanical linkage connecting the diaphragm