Overpressure Relief Valve (OPRV) — Thread: 1.846-20UN-2A What this product does Protects inflatable dive and buoyancy devices by releasing excess internal pressure to prevent overinflation damage. Designed specifically for use on BCDs, SMBs, lift bags and other buoys that require controlled overpressure relief. Key benefits Safety: Prevents blowouts and fabric stress by venting excess pressure reliably. Compatibility: Uses the specified 1.846-20UN-2A thread for secure, standard-fit installation. Ready-to-fit: PU holder / flange is included so the valve can be mounted and welded into place. Professional installation: Welding requires a high-frequency (HF) welding machine, ensuring a strong, leak-resistant bond when installed correctly. What’s included Overpressure relief valve (OPRV) with thread 1.846-20UN-2A PU holder / flange for mounting Important specifications (stay consistent with product details) Thread specification: 1.846-20UN-2A PU holder / flange: included Welding requirement: installation requires an HF welding machine Installation and use notes The valve must be welded into the PU holder/flange using a high-frequency welding machine to achieve a secure, pressure-tight installation. Professional or experienced technicians are recommended for welding and final testing to ensure proper function and safety. After installation, test the device under controlled conditions before full operational use. Typical applications BCDs: Fits into inflator or bladder panels to prevent overpressure during surface inflation or rapid gas expansion. SMBs (surface marker buoys): Protects the marker from overinflation when filling at depth or during sudden ascent. Lift bags and rescue buoys: Prevents dangerous overpressure during inflation for salvage, lifting, or rescue operations. Practical considerations Verify thread compatibility (1.846-20UN-2A) with your existing fittings before ordering. Ensure access to an HF welding machine and qualified personnel for installation. Perform routine checks after installation to confirm the valve opens and reseals as intended. This OPRV is a focused safety component for buoyancy and inflatable devices. It combines a standard thread size with an included PU holder/flange for professional HF-welded installation to help protect your gear from overpressure-related damage.