Wow just seen this post! I was probably putting the Timbren's on my truck. Yes as Bill Hill said, "" This appears to be a SOLID rubber suspension system that looks like an air bag, but doesn't have any fittings for air."When the truck is not in use neither are the Timbren's. I am pleased with them...they took the squat out of the truck and the ride is much better. Very easy to put on too. They are warranty for life and the price ran about $154.00 that was shipped. I too was going to go the air bags ...no need now.
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