This is the 1/8" to 1/8" Hose Adapter from Model Maker. FEATURES: Brass construction External threads, both sides Required when using the Mini Regulator (HCAR4027) with the Double Action Paint Gun (HCAR4016) INCLUDES: One 1/8" to 1/8" Hose Adapter REQUIRES: 3/8" wrench for assembly SPECS: Length: 25.4" (1") Diameter: 3/8-28 threads COMMENTS: If the 1/8" to 1/4" adapter is needed, use HCAR4107 NNA 1/24/05 ir/jxs