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The AQUALINE GCAP-300 is a 3-inch threaded galvanized cap designed to close off the end of a threaded pipe. It threads directly onto a male-threaded pipe end, providing a secure, corrosion-resistant seal. The galvanized steel construction offers durable protection against rust in both wet and dry environments. This fitting is installed by licensed plumbers, irrigation technicians, and pool and spa service professionals working on pipe terminations, system winterizations, or pressure-test preparations.
The GCAP-300 is suited for residential and light commercial applications wherever a 3-inch threaded pipe end must be capped. Common scenarios include capping unused branch lines, isolating sections of a water distribution system, or temporarily sealing supply lines during service work. Its standard threaded design makes it a straightforward replacement or add-on fitting for a wide range of threaded piping systems.
Designed as an OEM-style replacement or direct-fit cap for 3-inch male-threaded pipe installations in plumbing, irrigation, and pool piping systems.
Installation is performed by a licensed plumber or qualified pipefitter. Shut off the water supply and depressurize the line before threading on the cap. Apply thread sealant tape or compound to the male threads prior to installation to ensure a leak-free seal. Follow applicable IPC and local plumbing code requirements for fitting installation and pressure testing.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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