10 x Speedfit 1/2" x 3/8" BSPT male stem adaptors. John Guest spigot PI051603S
10 x Speedfit 1/2" x 3/8" BSPT male stem adaptors. John Guest spigot PI051603S. JG Speedfit. 10 x John Guest 1/2" x 3/8" BSPT male spigot / stem adaptors. The spigot is 1/2" and the thread size is 3/8" BSPT male.