1/2×28 or 5/8×24 Thread Protector for the 10″ Aluminum 1.75″ OD Solvent Trap Tubes. These thread protectors are included in our 10″ Aluminum 1.75″ OD Solvent Trap Kits and are made from 7075 Aircraft Grade Aluminum. These thread protectors have a m34x1.25 thread pitch.