Has anyone tried these on the astra?

Sorry, can't help with their suitability for fitting on an Astra, I bought these for a Ford Scorpio and have not yet fitted them. They are quite big so need a bit of space . I purchased Subaru wiring kit for them from the US to make the install a bit quicker and neater

are these a pair a pair or just one

Sold as a pair with a relay. There are more details in the product description.

I bought these to use on my motorbike but the connections look horribly exposed. Are these weatherproof?

Hello Geoff, No they are not weatherproofed when manufactured. You will have to use plastic shrouded blade connectors which should offer some level of protection. If you are using the existing horn wiring circuit and connections on your motorbike. then these may already be fitted with shrouded connectors. I hope this helps

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HellaSignal Horn - PERFORMANCE HORN B133 SET - 12V - 118dB(A) - Frequency Range: 300/500Hz - Low Tone/High Tone - Electric - Housing Colour: Red/Black - Quantity: 2 - 3AG 003 399-801

HellaSignal Horn - PERFORMANCE HORN B133 SET - 12V - 118dB(A) - Frequency Range: 300/500Hz - Low Tone/High Tone - Electric - Housing Colour: Red/Black - Quantity: 2 - 3AG 003 399-801

Product ID: 48345323

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Details

Brand
Hella
Colour
red
Item dimensions L x W x H
13 x 12.5 x
Style
Set (2 pieces)
Noise level
118 dB

⚡66W power efficiency

🔊118 dB(A) thunderous sound

🌡️-40°C to 90°C extreme durability

Description

🔊 Make your presence impossible to ignore with HellaSignal’s powerhouse horn!

PLUG PLAY POWER - Easy installation with 6.3 mm tab terminals and M8 fixing screw holder for hassle-free setup.
DUAL TONE PRECISION - Experience rich, layered alerts with a 300/500Hz low and high-frequency range for maximum audibility.
UNMATCHED SONIC IMPACT - Cut through the noise with a commanding 118 dB(A) sound pressure level that demands attention.
RUGGED STYLISH DESIGN - Sleek black housing with a bold red protective grid combines durability with standout aesthetics.
BUILT TO BRAVE THE ELEMENTS - Engineered to perform flawlessly from -40°C to 90°C, ensuring reliability in any climate.

The HellaSignal Horn B133 Set delivers a powerful 118 dB(A) dual-tone sound (300/500Hz) powered by an efficient 66W electric system. Built with a robust black and red galvanised metal housing, it withstands extreme temperatures from -40°C to 90°C. Compact and easy to install, this 12V horn set is engineered for professionals who demand reliability and standout performance in every signal.

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Manufacturer	Hella Limited
Brand	Hella
Model	3AG 003 399-801
Product Dimensions	13 x 12.5 x 14.2 cm; 875.43 g
Item model number	3AG 003 399-801
Exterior	Machined
Manufacturer part number	3AG 003 399-801
OEM Part Number	4381 85115;438185115
Item Weight	875 g

HellaSignal Horn - PERFORMANCE HORN B133 SET - 12V - 118dB(A) - Frequency Range: 300/500Hz - Low Tone/High Tone - Electric - Housing Colour: Red/Black - Quantity: 2 - 3AG 003 399-801

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