Can't screw caps on part that pierces inground line. Flattened wires so cap stars OK but just turns & wont catch the threads to tighten. Any ideas?

You have to press down hard while holding on the bottom. I used a pair of pliers to help tighten.

Can these be used as a T connector to branch off an additional line (zone) of lights from the main line?

Yes, that is what they are used for.

critter chewd ours, are these good for splicing?

You can splice if you use the waterproof splices also on amazon. Be careful to watch the wire sizes to get the right connector

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💡 Light up your landscape with zero hassle and total reliability!

BUILT TO LAST - Durable nylon-fiberglass body with nickel-plated brass pins resists corrosion and ensures reliable conductivity
ALL IN ONE PACK - 8 connectors cover 8 lights—perfect for upgrading your entire outdoor lighting setup
EFFORTLESS SETUP - No crimping or splicing—3-piece screw-on design for quick, tool-free installation
PEACE OF MIND WARRANTY - 60-day money-back and 5-year replacement warranty with lifetime support
UNIVERSAL COMPATIBILITY - Works seamlessly with 12/14/16/18 AWG wires and multiple landscape lighting types

SUNVIE Fastlock2 connectors simplify outdoor lighting by enabling quick, waterproof, and corrosion-resistant connections for 12-18 gauge low voltage wires. Each pack includes 8 connectors, enough for 8 lights, designed with a patented screw-on system that eliminates crimping or splicing. Built from durable nylon-fiberglass and nickel-plated brass, these connectors ensure long-lasting performance in any outdoor environment, backed by a comprehensive warranty.