1.Lightweight body increases operator comfort and helps minimize downtime due to fatigue (all models). 2.Availablegas valve improves shielding gas control . 3.Flexible neck improves torch control in limited-access area. 4.Extended-reach flexible neck offers better joint access in a compact package. 5.Combinedflexible neck andvalved model is ideal for welding in limited-access joints using power sources without gas solenoids (WP-9FV). 6.Pencil-style model requires no back cap for greater access to confined areas . 7.WP9,wp-17,wp-18c,wp-18sc,wp-20,wp-20s,wp-24,wp-24w,wp-25,wp-26,wp-22,wp-23.