Have to word as question-who here does not know that arb uses 1/8 in bsp fitting?

Why are you asking if you know already?

Can I use it as a switch for an air horn?

Depending on the compressor and air horn you have, the answer is yes. The Solenoid opens and closes a valve on the compressor. Some compressors only have one air port, so you may have to add a manifold kit (https://www.amazon.com/ARB-171503-Air-Compressor-Manifold/dp/B00CJ1VKE8/ref=pd_sbs_263_10?_encoding=UTF8&pd_rd_i=B00CJ1VKE8&pd_rd_r=M7GEG81XS0YJED75R9TJ&pd_rd_w=ODhKx&pd_rd_wg=cLI4Y&psc=1&refRID=M7GEG81XS0YJED75R9TJ) to give you an extra air port. You'll also need an extra rocker switch to run the air horn. You need one switch to turn on and off the compressor and additional switches for lockers, air hoses, air horns, etc. A sPOD is a great way to wire up multiple switches. ARB also makes kits that consist of air line and air valves https://www.amazon.com/ARB-170301-Engine-Intake-Adapter/dp/B005Q4WUDK/ref=pd_bxgy_263_3?_encoding=UTF8&pd_rd_i=B005Q4WUDK&pd_rd_r=P6ZJYARM6CJ8KC1HGD1F&pd_rd_w=ZfSDu&pd_rd_wg=h0CwZ&psc=1&refRID=P6ZJYARM6CJ8KC1HGD1F https://www.amazon.com/ARB-170201-Air-Fitting-Straight/dp/B00042KQZS/ref=pd_bxgy_263_2?_encoding=UTF8&pd_rd_i=B00042KQZS&pd_rd_r=61993K2K5T7KSJNB7YDY&pd_rd_w=I73KA&pd_rd_wg=uxV0E&psc=1&refRID=61993K2K5T7KSJNB7YDY As long as you have the right parts, it's a pretty straight forward installation. Just make sure not to run the air line next to anything sharp or hot enough to melt it.

What size fitting is it?

ARB uses an 1/8 inch BSP fitting - just called their tech line. Amazon sells BSP to NPT, I went with Viair who sells 2 for $11.

How did you install the part. the threaded end inside the solenoid doesnt wwnt to turn and the rntite unit cnanot rotate as it hits the arb housing.

Not sure what to tell you. The threaded part DOES turn inside the main housing. You should be able to hold the housing still and put a wrench on the metal threaded part and tighten it into the ARB compressor.

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🔧 Lock in your off-road edge with ARB’s ultimate air solenoid!

COMPACT LIGHTWEIGHT - At just 109 grams and a sleek aluminum exterior, it’s built to save space without compromising strength or performance.
PRECISION AIR CONTROL - Engineered to manage air locker and tank supply with up to 155 PSI, ensuring instant and reliable locker engagement.
PLUG PLAY SIMPLICITY - Equipped with ARB’s proprietary electrical connector and push-in fittings for effortless installation and quick replacement on the go.
TRAIL READY RELIABILITY - Keep your ARB Air Locker performing flawlessly with a rugged, OEM-grade solenoid designed for harsh off-road conditions.
REBUILDABLE REPAIR FRIENDLY - Designed for easy maintenance and repair, so you can stay on the trail longer and avoid costly downtime.

The ARB 180103 Aluminum Solenoid is a durable, OEM replacement 12V electric valve designed specifically for ARB Air Lockers. Featuring a robust aluminum body, it supports up to 155 PSI and includes ARB’s proprietary connectors for seamless installation. Lightweight and rebuildable, this solenoid ensures reliable air control for your locker and air tank, making it an essential trail-ready upgrade or spare for serious off-roaders.

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Manufacturer	ARB
Brand	ARB
Model	180103
Product Dimensions	9.65 x 7.11 x 3.3 cm; 108.86 g
Item model number	180103
Is Discontinued By Manufacturer	No
Exterior	Aluminum
OEM Part Number	180103
Item Dimensions L x W x H	9.7 x 7.1 x 3.3 cm
Color	silver/metallic grey
Item Weight	109 g

ARB 180103 Aluminum Solenoid 12VDC 1/8" This is the official replacement 12V electric air solenoid for ARB

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