Main pressure reducer Vulkan H40/300 Effect nitrogen DIN 477-5, 0 - 40 bar, 120 Nm?/h according to ISO 7291, single-stage design, with pre-pressure compensation for constant back pressure with falling pre-pressure, with safety pressure gauges according to DIN EN ISO 5171. Maximum inlet pressure: 300 bar. Output pressure: 0 - 40 bar adjustable. Maximum output: 120 Nm?/h at 40 bar back pressure. Inlet: W30x2RH U-nut according to DIN 477-5. Outlet connection: G1/2RHak according to EN 560. Inlet pressure gauge: 0 - 400/300 bar. Outlet pressure gauge: 0 - 60/40 bar. Width x height x depth: 200 x 210 x 75 mm. Important note for 300 bar pressure reducers - please check your bottle connection! Cylinder pressure regulators for 300 bar have a manual connection according to DIN 477 Part 5 and are NOT backward compatible. This means they do NOT fit cylinders with a maximum filling pressure of 200 bar! If necessary, see our following tutorial, 3: Difference between 200 bar and 300 bar pressure regulators. This main pressure reducer is available in the following versions, among others: Gas purity/diaphragm: Standard: - for technical gases up to a gas purity of 4.5 with standard membrane Optional (surcharge): - for pure gases up to a gas purity of 5.0 with stainless steel membrane SS321 (1.4541) Special outlet screw connection: Standard: - G1/2RHak according to EN 560 Options (surcharge): Item number Gas purity Outlet connection 303540 for technical gases up to 4.5, with standard membrane G1/2RHak according to EN 560 303540-800 for technical gases up to 4.5, with standard membrane external thread G1/4" RHk according to EN560 303540-870 for technical gases up to 4.5, with standard membrane external thread G3/8" RHk according to EN 560 303540-6M for technical gases up to 4.5, with standard membrane, compression fitting made of stainless steel 6mm 303540-8M for technical gases up to 4.5, with standard membrane, compression fitting made of stainless steel 8mm 303540-10M for technical gases up to 4.5, with standard membrane, compression fitting made of stainless steel 10mm 303540-12M for technical gases up to 4.5, with standard membrane, compression fitting made of stainless steel 12mm 303540-15M for technical gases up to 4.5, with standard membrane, compression fitting made of stainless steel 15mm 303540-18M for technical gases up to 4.5, with standard membrane, compression fitting made of stainless steel 18mm 303540-MM for pure gases up to 5.0, with metal membrane made of SS321 (1.4541) G1/2RHak according to EN 560 303540-MM-800 for pure gases up to 5.0, with metal membrane SS321 (1.4541) external thread G1/4" RHk according to EN560 303540-MM-870 for pure gases up to 5.0, with metal membrane SS321 (1.4541) external thread G3/8" RHk according to EN 560 303540-MM-6M ​​for pure gases up to 5.0, with metal membrane SS321 (1.4541) compression fitting VA 6mm 303540-MM-8M for pure gases up to 5.0, with metal membrane SS321 (1.4541) compression fitting VA 8mm 303540-MM-10M for pure gases up to 5.0, with metal membrane SS321 (1.4541) compression fitting VA 10mm 303540-MM-12M for pure gases up to 5.0, with metal membrane SS321 (1.4541) compression fitting VA 12mm 303540-MM-15M for pure gases up to 5.0, with metal membrane SS321 (1.4541) compression fitting VA 15mm 303540-MM-18M for pure gases up to 5.0, with metal membrane SS321 (1.4541) compression fitting VA 18mm