Are they re-usable? Can I re-use it to connect a different set of wires later? Thanks.

As mentioned, some of the Dielectric grease is displace by the wires and pressed into the wires. If you are adding one more wire to the bunch, I see no reason why you can't reuse in this case as you are adding mass to the cavity. If you want to be anal, you could add more Dielectric grease to the nut and wires (after twisting them) prior to reuse of the wire nut; cost is about $0.50 per nut if you are considering material cost. But in a pinch, if you run out of nuts, you can add Dielectric grease to finish the job.

Does the silicone inside harden over time to help keep the wires inside tight and contained? Thanks!

No the silicone in the wire caps are like Vaseline never gets solid. I have a jar of Vaseline that is around 50 or so years old and it's just like they we bought it.

How many 12 or 16 gauge wires can these hold in one cap? Thanks

I don't know any thing about 12 gauge wire, but for 16 gauge wire it can hold at least 2 .

I need to join a bundle of three #14 stranded copper wire. is the wpconn10 the right choice?

The package lists 2 #14 along with other combinations. 3 #14 is not listed.

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Rain Bird WPCONN10 Waterproof Grease Cap Wire Connectors, 10-Pack

Rain Bird WPCONN10 Waterproof Grease Cap Wire Connectors, 10-Pack

Product ID: 1732408

Details

Color
Black/Green
Connector Type
Twist
Contact Material
Copper
Insulation Material
Silicone
Terminal
Screw Terminal

⚡600V surge protection

💧Silicone gel waterproof seal

☀️UV & chemical resistant

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Description

🔌 Seal the deal with Rain Bird’s waterproof wire connectors—because your connections deserve zero downtime!

HIGH VOLTAGE ENDURANCE - Rated to withstand up to 600 volts, safeguarding your irrigation system’s wiring.
DURABILITY MEETS SAFETY - UV and chemical-resistant materials protect connectors from environmental damage and degradation.
WEATHERPROOF RELIABILITY - Silicone gel-filled caps ensure watertight seals even in the harshest wet conditions.
BULK PACK FOR PRO EFFICIENCY - 10-pack bundle designed for seamless project scalability and cost-effective maintenance.
EFFORTLESS ONE STEP INSTALLATION - No pre-twisting needed—just insert and twist for a secure connection.

Rain Bird WPCONN10 Waterproof Grease Cap Wire Connectors come in a convenient 10-pack, featuring silicone gel-filled caps that provide a mess-free, waterproof seal. Designed for quick one-step installation without pre-twisting, these connectors withstand up to 600 volts and resist UV and chemical damage, ensuring long-lasting, reliable connections for irrigation valve and controller wiring under all weather conditions.

Specifications

ASIN	B0046735LO
Best Sellers Rank	#4,534 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #12 in Automatic Irrigation Accessories
Brand Name	Rain Bird
Color	Black/Green
Connector Gender	Female
Connector Type	Twist
Contact Material	Copper
Customer Reviews	4.6 4.6 out of 5 stars (1,060)
Global Trade Identification Number	00077985013370
Insulation Material Type	Silicone
Item Dimensions L x W x H	13.75"L x 13.75"W x 10"H
Item Type Name	Rain Bird WPCONN10 Waterproof Grease Cap Wire Connectors, 10-Pack
Item Weight	0.01 Ounces
Manufacturer	Rain Bird
Material Type	Metal, Plastic
Maximum Voltage	600 Volts
Model	N90300
Number of Items	1
Part Number	WPCONN10
Specification Met	Ul 486a
Stud Size	1/2
Temperature Rating	221 degree fahrenheit
Terminal	Screw Terminal
UPC	077985013370
Unit Count	10 Count

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