Cylinder body, piston and gland nut “Power Tech” treated for corrosion and abrasion resistance. Standard domed piston rod (5-30 ton) or swivel cap (50- 150 ton) minimize effects of off-center loading. Unique heavy duty spring provides fast piston return. A 9796 3/8" NPTF female half coupler is standard with each cylinder (the RLS50 has a 3/8" coupler which is not angled). Oil ports are 3/8" NPTF. Couplers on all cylinders, except RLS50, are angled upward for extra clearance.