Groco Pipe to Hose Bronze Fitting Groco bronze Pipe to hose fitting. Standard Flow - the hose ID is the same as the pipe size ie PTH-750 has 34 NPT pipe thread and accepts 34 ID hose. Sizes from 12 to 5 UL Listed 647B Specifications PTH-5062 Thread NPT 12 Hose ID 12 or 58 A 2.7 B 1.8 PTH-750 Thread NPT 34 Hose ID 34 A 2.39 B 1.38 PTH-1000 Thread NPT 1 Hose ID 1 A 2.48 B 1.38 PTH-1250 Thread NPT 1-14 Hose ID 1-14 A 2.65 B 1.55 PTH-1500 Thread NPT 1-12 Hose ID 1-12 A 3 B 1.9 California Residents W