difference between nathan airchime

i am in the market for some nathan air chimes probally k3la’s. but i wouldnt know the diff. between them and the p3’s. i know what airchimes look like but how do you tell the different ones? thanks

http://www.hornblasters.com/products/category.php?c=train-horns-and-air-horns

It’s the tone and chord of them.

http://www.jacksonperformanceproducts.com/hornpitches.htm

there is no visual difference?

http://74.125.93.132/search?q=cache:http://www.nathanpseries.info/history.html

http://trainiax.net/mehornk5.php

http://atsf.railfan.net/airhorns/index.html

P is is smaller, aside from the 1 bell it is longer then a K1 bell. They are cheaper, use less air, and are not as loud as a K.

K is more expensive, but its alot louder.

I prefer the sound of the K’s my self. Some people prefer the sound of the P’s though.