Double Shutoff Valve Systems

Dip-tube is never handled by end user thus eliminating a significant potential source of DEF contamination

Shut off valve closes automatically when coupler is disconnected from dip-tube

High cost of shut-off valve mechanism make them more expensive to use in Single-trip/One-way applications than Single shut off with Shipping Plug systems.

Stainless steel couplers are expensive vs. rugged plastic couplers.

Plastic versions promoted for use in single-trip applications are fragile, prone to leakage, weak in side loading, tend to have a deep cavity in the top that collects contamination which is then "pushed" into the fluid stream when the coupler is attached and finally much more costly than closed versions sealed with a shipping plug