The specifications and main parameters Working Pressure: 1500psi Bottom Thread: 1.3/4 , 2 , 2.1/2 , 3 , 3.1/2 , 4 Bottom Connection: Box or Pin, API Tubing or Line Pipe thread. Material: AISI1045/4130 casting steel or ductile iron Split Cone Packing (rod sizes): 1 , 1.1/8 , 1.1/4 , 1.1/2 and 1.3/4