Type: Fittings Model Number: C type Quick connector Picture letter meaning: Meaning of Model Number Representation Bspt (Pipe Thread) 40 means Thread 4″ or Thread 1/2 (Bspt) 30 means Thread 3″ or Thread 3/8 (Bspt) 20 means Thread 2″ or Thread 1/4 (Bspt)