Seal off 4" piping with confidence using the STZ Industries 4 in. FIP Galvanized Malleable Iron Cap. Built for durability, this cap combines a malleable iron body with a rugged galvanized finish to resist corrosion in demanding environments, whether in indoor plumbing projects or outdoor installations.
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Connection: 4 in. FIP (female iron pipe) threads for a secure, leak-resistant fit on standard 4" pipe systems
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Material & finish: Malleable iron construction with galvanization to stand up to moisture, humidity, and exposure
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Pressure & temperature rating: Maximum 300 psi and 150°F, suitable for typical potable water and light irrigation applications
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Lead content: Lead-free design for safer handling in potable water lines
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Packaging: Bagged packaging for convenient storage and protection before installation
Ideal use scenarios include temporarily capping off a 4" water line during renovations, sealing unused or test segments in irrigation mains, or protecting exposed piping in service upgrades. The 4" FIP cap provides a reliable, resealable solution that’s easy to install and remove when the line needs to be reactivated.
Practical tips: clean and dry threads before installation, apply an appropriate thread sealant compatible with metal pipes, and snug the cap with a wrench without overtightening to avoid thread damage. After initial pressurization, inspect for leaks and reseal if necessary.
Designed for real-world plumbing needs, STZ Industries’ galvanized malleable iron cap delivers dependable performance, helping you complete projects with a solid, long-lasting seal on 4-inch lines.
