FIRMERST 18/7 Solid Sprinkler Wire 150 ft — 18AWG 7-Conductor Direct-Burial, UV-Resistant Jacket

FIRMERST 18/7 Solid Sprinkler Wire is a 150-foot, 18AWG*7C solid copper irrigation cable built for direct-burial sprinkler systems controlling up to six valves.

This heavy-duty sprinkler cable from FIRMERST combines solid copper conductors with a UV-resistant PVC jacket to deliver reliable low-voltage signal transmission for residential and commercial irrigation systems. Designed to handle up to six valve connections, the 18/7 configuration balances conductivity and ease of routing, while the sunlight-resistant outer jacket protects against long-term outdoor exposure. The wire is intended for low-voltage systems (30V or less) and is rated for direct burial, offering a straightforward option for new installs, repairs, or upgrades.

What makes this 18/7 wire suitable for underground sprinkler systems?

The FIRMERST 18/7 solid sprinkler wire is constructed with seven individual 18AWG solid copper conductors encased in a rugged PVC jacket that resists UV, dust, and moisture. Solid copper reduces signal loss and corrosion risk compared with cheaper composite conductors, and the jacket’s thickness helps prevent mechanical damage when buried. This combination delivers dependable performance where water and soil exposure are concerns.

• 150 feet length for common residential layouts and short commercial runs
• Seven solid copper conductors for multi-valve control (up to six valves)
• Sunlight/UV-resistant PVC jacket for prolonged above- and below-ground exposure
• Direct burial rated and waterproof for typical irrigation installations

How do I install FIRMERST 18/7 cable with my controller and valves?

Installation is straightforward: unspool the cable, cut to length, strip conductors, and attach to valve solenoids and the controller according to your system wiring diagram. Because the cable is solid-core, avoid repeated flexing at termination points and use proper strain reliefs or conduit sleeves where the wire enters valve boxes to reduce metal fatigue. Bury the cable at recommended depths or run it through conduit in high-traffic areas for extra protection.

• Cut and strip conductors to match valve/controller terminals
• Use waterproof wire nuts or gel-filled connectors for underground splices
• Provide strain relief and avoid tight repetitive bends to reduce fatigue
• Bury at recommended depth or route inside conduit where needed

Will this wire work with my low-voltage irrigation system and how many valves can it support?

Yes — the FIRMERST 18/7 cable is intended for low-voltage irrigation systems operating at 30 volts or less. The 7-conductor design supplies a common and six separate control conductors, so you can operate up to six zones directly from one cable run plus a common wire, making it ideal for many home and light commercial controllers. For systems with more zones, use multiple runs or a larger conductor count cable.

• Compatible with low-voltage irrigation controllers (≤30V)
• Seven conductors provide one common plus six valve control wires
• For more than six zones, add additional cable runs or expand wiring
• Solid copper reduces resistance and improves signal reliability

How durable is the jacket and what environmental conditions can it handle?

The PVC jacket on FIRMERST 18/7 sprinkler wire is formulated to resist sunlight, UV degradation, dust, and moisture, enabling prolonged outdoor and direct-burial use. While the jacket protects against environmental exposure, remember that solid-core conductors are less tolerant of frequent bending or flexing — plan permanent runs and avoid repeated movement. For areas with extreme mechanical stress, place the cable inside conduit or protective tubing.

• UV-resistant PVC jacket for extended sun exposure
• Waterproof and dust-resistant for underground applications
• Direct-burial rated for typical irrigation trenching
• Avoid repetitive bending to prevent metal fatigue in solid conductors

Who is this for: The FIRMERST 18/7 Solid Sprinkler Wire is aimed at homeowners, landscape contractors, and facility maintenance teams installing or repairing low-voltage irrigation systems with up to six zones. It’s a practical choice when you need a reliable, direct-burial rated cable with solid copper conductors and a UV-resistant jacket for outdoor durability. Choose this cable for new lawn or garden installs, routine upgrades, or when replacing worn or damaged irrigation wiring.