Superpro High-Thrust Caulking Gun 400ml – 25:1 Black

The Superpro Caulking Gun 400ml is a robust professional applicator designed for demanding sealant, caulking and cartridge-applied adhesive work. Its powerful mechanism produces a 25:1 thrust ratio and approximately 4.5kN of dispensing force, helping the user apply thicker materials with considerably less trigger effort — and it is widely regarded as one of the easiest professional manual guns to use.

Built for regular trade use, the gun combines a strong black metal cartridge frame with an ergonomic trigger and handle. The high mechanical advantage provides smooth, controlled dispensing and helps maintain a consistent bead during longer applications.

The frame accepts compatible rigid cartridges and tubes up to 400ml, including many commonly used 290ml, 300ml, 310ml and 380ml cartridges. This makes it suitable for professional sealants, grab adhesives, mastics and other compatible cartridge-based products.

Key Features

• Professional high-thrust manual caulking gun
• Powerful 25:1 mechanical thrust ratio
• Produces approximately 4.5kN of dispensing force
• Accepts compatible cartridges and tubes up to 400ml
• Suitable for dispensing thicker sealants and adhesives
• Robust metal cartridge frame
• Ergonomic handle and trigger design
• Smooth action for controlled, consistent application
• Quick-release mechanism for retracting the plunger
• Curved plunger-rod hook for convenient storage
• Durable black finish
• Designed for professional trade and workshop use

Suitable Applications

• Applying silicone and construction sealants
• Dispensing compatible grab adhesives
• Applying mastics and decorators’ caulk
• Window and door installation
• Kitchen and bathroom fitting
• Worktop and splashback installation
• Interior and exterior joint sealing
• Cabinet making and joinery
• General building and construction work
• Professional property maintenance

Technical Specification

High-Thrust Performance

The 25:1 mechanism delivers substantially more mechanical advantage than a standard skeleton caulking gun. This makes the Superpro particularly useful when working with thicker or more resistant materials that require greater pressure to dispense.

The additional thrust can reduce hand fatigue during repeated applications while providing greater control over the flow and size of the finished bead.

Cartridge Compatibility

This applicator is intended principally for compatible rigid cartridges and tubes up to 400ml. Product viscosity and cartridge dimensions can vary, so the cartridge manufacturer’s application instructions should always be checked before use.

This is not an enclosed barrel applicator for unsupported foil or sausage packs. A compatible combination or sausage gun should be selected for foil-packed products.

Frequently asked questions

What size cartridges does the Superpro Caulking Gun accept?

It accepts compatible rigid cartridges and tubes up to 400ml.

What does the 25:1 ratio mean?

The mechanism multiplies the pressure applied to the trigger, producing significantly more dispensing force than a standard general-purpose caulking gun.

How much thrust does the gun produce?

The applicator produces approximately 4.5kN of thrust.

Is it suitable for thick sealants and adhesives?

The high-thrust mechanism makes it suitable for many thicker cartridge-applied products. Always check the product manufacturer’s applicator recommendations.

Can it be used with standard 310ml cartridges?

Yes, compatible 310ml cartridges can be used because the frame accepts cartridges and tubes up to 400ml.

Can it dispense foil sausage packs?

No. An enclosed combination or sausage gun should be used for unsupported foil packs.

Is a cartridge included?

No. The product consists of the applicator gun only.

Browse our complete selection of fillers, caulks and sealant accessories. Compatible sealants and adhesives can also be found in our Sika Everbuild collection.