Home / Ground Joints / Indian Joints / GL-18 Threaded Glass Vial Tube with Cap GL-18 Threaded Glass Vial Tube with Cap Manufacturer: Indian Glass Manufacturers SKU: GL-18-MAIN Price: $2.00 Availability: In Stock A size 18 open ended, externally threaded glass vial tube with a black plastic twist on cap. Related Products 10/14 Transition Low Profile Bushing Adapter - India 14/19 Transition Low Profile Bushing Adapter - India 10/19 Male Ground Joint - India 14/23 Male Heavy Wall Ground Joint on 12 x 2.0 - India 10/19 Female Ground Joint - India 14/23 Female Bistabil Ground Joint on 22 x 3.0 - India 14/23 Female Ground Joint - India 19/26 Male Ground Joint - India