This Dispenser includes the mixing gun and one integrated 1:1 and 2:1 ratio plunger. This single plunger fits both types of mix ratios. The dispenser is extremely important to the adhesive dispensing process. A 2-component adhesive can only reach its full potential if constant metering of the correct ratio is ensured. The DSP-50ml double-barrel dispenser is a precision tool that is suited for industrial, professional and DIY use and is very user-friendly. This dispenser works with Loctite, Devcon, Araldite, Gorilla, and all others with the standard 50ml design with 1:1 or 2:1 mixing ratios, which are the dominant most popular mixing ratios used today.