This inline check valve prevents dangerous backflow in gas welding systems. The brass construction withstands high pressure and temperature. The 3/8" BSP female threads provide standard connections. The spring-loaded mechanism ensures positive sealing in any orientation. The low cracking pressure (0.5psi) maintains normal system operation. The compact design (2" overall length) fits in tight spaces. Ideal for oxy-fuel setups to prevent mixed gas hazards. The smooth interior bore minimizes flow restriction. The corrosion-resistant finish ensures long service life. A critical safety component for professional welding and cutting operations.