The hydraulic system is protected from internal damage by a patented by-pass mechanism. Machined and polished cylinders with die-cut threads provide non-abrasive leak-free， durable performance. Fabricated from hard-cast steel with heat-treated critical stress areas. A serrated heat-treated saddle provides a generous lifting area and secure grip. Heat-treated extension screw allows low pick-up height adjustment and maximum lift height U.S. patented built-in by-pass device protects the hydraulic system from over pumping damage. A unique cross-type forged release valve assures positive control. A wide， rugged base provides stability and strength. Critical stress points are reinforced in all models for added durability and dependability.

Pro-Lift B-004W bottle jack is a welded bottle jack with 4-Ton capacity that is designed for both residential and commercial use， its serrated， heat treated saddle provides generous lifting area and secure grip

With the lifting range of 8-1/4 in. to 15-3/4 in.， it allows you to work in the confined space and fit under low vehicles， and the adjustable screw top extension adds the versatility to allow low pick-up height adjustment and maximum lift height

Fabricated from hard-cast steel with heat-treated critical stress areas， and the inner/outer welded structure delivers leak-free performance， and， the wide rugged base provides stability and strength， critical stress points are reinforced for added durability and dependability

Pressure pump is designed to lift with minimal effort， integrated with a patented by-pass mechanism and patented built-in by-pass device protects hydraulic system that protects the hydraulic system from extending beyond limits

Welded bottle jack meets ASME PASE safety standards and includes a limited 1-year manufacturer warranty from the date of purchase