The Parker RD101K30 is a premium-quality, direct-acting hydraulic cartridge relief valve engineered for reliable pressure limiting and relief functions in demanding hydraulic circuits. Manufactured by Parker, a global leader in motion and control technologies, this valve features a convenient hand-adjustable knurled knob for quick and precise pressure setting adjustments. Its robust design includes a durable hex locking body, a threaded cartridge mounting section for secure and straightforward installation, and an O-ring sealed nose port to ensure leak-free operation. Designed to protect hydraulic systems from over-pressurization, the RD101K30 delivers consistent performance, safety, and longevity in both industrial and mobile hydraulic applications.