I have purchased two packs of L2 air chucks and am very pleased with the quality and ease of use. I had to deduct a star because my Milton inflator didn't fit the small ball cartridge which has to be the worst cartridge ever designed for cars and bikes. It is very difficult to get a good seal and an accurate pressure reading. In Milton's defense, I think this cartridge is designed for large truck tires. My new JACO L2 seals immediately and is very easy to remove. I bought a 1/4" male 1/4" NPT hose repair fitting. The problem is solved. Now I have the compressor of my dreams. I have registered my cartridges at jacowarranty.com and intend to keep the lifetime warranty on them.