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 precision and durability!

GLOBAL COMPATIBILITY - Designed for international use with adaptable fit and instructions
LIGHTWEIGHT COMPACT - At just 109g and 9.65 x 7.11 x 3.3 cm, it’s easy to handle and install
DURABILITY MEETS DESIGN - Powder-coated finish ensures long-lasting resistance to wear
UNMATCHED PRESSURE PERFORMANCE - Handles up to 145 PSI for reliable compressor control
PRECISION FIT FOR ARB AIR COMPRESSORS - Specifically engineered as a direct replacement for Part #73252

The ARB 180103 Replacement Solenoid is a compact, lightweight, and powder-coated component engineered to deliver up to 145 PSI pressure control. Designed as a direct replacement for ARB air compressors, it ensures durability and reliable performance, making it an essential upgrade for professionals and enthusiasts seeking dependable compressor operation worldwide.

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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
Exterior	Powder-coated
Manufacturer Part Number	180103
OEM Part Number	180103
Item Weight	109 g

ARB 180103 Replacement Solenoid

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