Herz blind plug with external thread G 3/4 and O-ring

Herz blind plug with external thread G 3/4 and O-ring is a threaded closure designed to seal open ports, valves or fittings with a G 3/4 connection. The product combines a mechanical external G 3/4 thread with an elastomer O-ring to provide a removable yet reliable seal suitable for plumbing, heating and many industrial applications. The design allows for simple installation and later removal without damaging the mating thread when maintenance or modifications are required.

Advantages

This blind plug provides a secure threaded closure with an additional compression seal from the supplied O-ring, reducing the risk of leaks at the joint. Its external thread and compact form make it compatible with standard G 3/4 female fittings. The removable design enables repeated use: the part can be installed, removed and resealed during routine maintenance. The combination of mechanical thread and elastomer sealing offers dependable performance in systems where a temporary or permanent cap is required.

Suitable for

• Sealing unused ports on pipes and manifolds with G 3/4 connections
• Closing service ports on heating radiators, boilers or plumbing units
• Temporary caps during installation, testing or flushing of systems
• Industrial equipment and machinery requiring removable sealed closures

Key specifications

• Connection type: external thread with G 3/4 standard profile
• Seal type: elastomer O-ring included for compression sealing
• Intended applications: plumbing, heating and industrial installations
• Function: removable threaded blind plug for temporary or permanent closure
• Compatibility: designed to mate with female G 3/4 fittings and ports

How to use

Ensure the mating female G 3/4 thread and sealing surface are clean and free of debris. Place the supplied O-ring into the designated groove or seating area on the blind plug if it is not pre-installed. Hand-start the external thread into the female fitting, then tighten until the O-ring compresses against the sealing surface to achieve a leak-free joint; if required, use an appropriate wrench to reach the final snugness but avoid over-torquing to prevent thread damage. For removal, back off the plug by turning counter-clockwise and inspect the O-ring for wear; replace the O-ring if signs of deformation or hardening are present before reinstalling.

Usage recommendations

Use compatible O-ring materials and torque values suitable for the system medium and operating temperature. Periodically inspect the seal and threads during maintenance and replace the O-ring if leakage or material degradation is observed.