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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🔧 Power your adventure with ARB’s ultimate air control solenoid!

HEAVY DUTY PERFORMANCE - Built from durable aluminum with a max pressure rating of 145 PSI to withstand rugged off-road conditions.
TRAIL READY RELIABILITY - Keep your ARB Air Locker fully operational with this OEM-grade solenoid—never get stranded without control.
PRECISION FIT EASY SWAP - Designed with ARB’s electric connector and standard 1/8" BSPT threading for seamless, no-hassle replacement.
SERVICEABLE REBUILDABLE - Extend the life of your solenoid with easy maintenance—carry a spare and fix it yourself on the go.
UNIVERSAL ATV COMPATIBILITY - Optimized for all-terrain vehicles, ensuring your air lockers and compressors perform flawlessly every ride.

The ARB 180103 Aluminum Solenoid is a robust 12V electric valve designed specifically for ARB Air Lockers and compressors. Featuring a durable aluminum build, 1/8" BSPT and push-in fittings, and a maximum pressure rating of 145 PSI, it ensures reliable air control in demanding off-road environments. Lightweight and serviceable, it’s the essential spare for any serious ATV or 4x4 enthusiast.

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Brand	ARB
Material	Metal
Colour	Silver/Metallic Gray
Item Weight	109 g
Vehicle Service Type	All-Terrain-Vehicles
Exterior Finish	Aluminium
OEM Part Number	180103
Manufacturer	ARB
UPC	698231383346
Model	180103
Product Dimensions	9.65 x 7.11 x 3.3 cm; 108.86 g
Item model number	180103
Manufacturer Part Number	180103
Assembly Required	No

ARB 180103 Aluminum Solenoid 12VDC 1/8" This is ARB's official replacement 12v electric Air Solenoid.

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