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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€ 10.98

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Description

🔧 Connect with confidence—wire protection that works as hard as you do!

BUILT TO WITHSTAND POWER SURGES - Rated for up to 600 volts, these connectors protect your system from unexpected electrical spikes.
ULTIMATE WATERPROOF RELIABILITY - Silicone gel-filled caps ensure your valve and controller wires stay dry and durable in any weather.
BULK PACK FOR PRO LEVEL PROJECTS - 10-pack supply keeps your irrigation system wired flawlessly without constant reordering.
EFFORTLESS ONE STEP INSTALLATION - No pre-twisting needed—just insert and twist for a secure, mess-free connection.
UV CHEMICAL RESISTANT DURABILITY - Engineered to resist harsh sunlight and chemicals, guaranteeing long-lasting outdoor performance.

Rain Bird WPCONN10 Waterproof Grease Cap Wire Connectors provide a quick, one-step, twist-on installation with silicone gel sealing to ensure waterproof, mess-free, and durable connections. Rated for 600 volts and built with UV and chemical-resistant materials, these connectors are designed for reliable outdoor irrigation wiring. Sold in a convenient 10-pack, they are perfect for professional-grade irrigation repairs and installations.

Specifications

ASIN	B0046735LO
Best Sellers Rank	#4,464 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #19 in Automatic Irrigation Accessories
Brand Name	Rain Bird
Color	Black/Green
Connector Type	Twist
Contact Material	Copper
Customer Reviews	4.6 4.6 out of 5 stars (1,057)
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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