Amazon.com: MHA-Zentgraf German Stainless Steel 316 High Pressure Ball Valve, 2 1/2” NPT Female Threaded, up to 6000 PSI (420 Bar), MKHP Type Hydraulic Flow Control Valve, 2 Port Shut-Off Valve : Industrial & Scientific
Check Valve Ball Poppet Type, Direct Acting SAE-08 Cartridge – 420 bar RV08A-01 – Leader Hydraulics
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Amazon.com: MHA-Zentgraf German Carbon Steel High Pressure Ball Valve, 1” NPT Female Threaded, up to 6000 PSI (420 Bar), BKH Type Hydraulic Flow Control Valve, 2 Port Shut-Off Valve : Industrial & Scientific