Can this be use around boiler pipe?

It's worked fine around central heating pipes in floors Check working temps on tube to see range it covers

It it suitable for bigger gapps .like around 20 x 10 cm ? If not, what would be the righy solution?

Not sure what the depth of your hole is or where it is. That size would have to be done in stages if just using this and it takes a few days to dry. Wire mesh - available on Amazon might be easier in combination with this?

How thick is this sealant i.e. how small can I cut the nozzle hole to? I have a fiddly job and need to add a length of tube

It isn’t that thick so you can cut the tube quite small. Takes longer but you can always increase the size.

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RENTOKIL MOUSE & RAT GAP SEALANT - Waterproof Sealant WIth An Anti-Chew Sticky Core - Blocks Entry Points To Prevent Rodent Access - Easy to Apply - Poison Free - 300ml, White

RENTOKIL MOUSE & RAT GAP SEALANT - Waterproof Sealant WIth An Anti-Chew Sticky Core - Blocks Entry Points To Prevent Rodent Access - Easy to Apply - Poison Free - 300ml, White

Product ID: 50797999

⚡Easy 48h dry application

💧Waterproof sealant

🦷Anti-chew sticky core

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Description

🚫🐭 Seal the gaps, stop the gnaw — rodent-proof your space like a pro!

TRUSTED EXPERTISE - Backed by 100+ years of Rentokil pest control innovation for professional-grade results.
RODENT PROOF BARRIER - Blocks pencil-width gaps rodents squeeze through with a tough, sticky core they hate.
POISON FREE PROTECTION - Safe, non-toxic formula that keeps your home rodent-free without harmful chemicals.
WEATHERPROOF DURABLE - Creates a long-lasting, waterproof seal that stands up to all elements.
QUICK EFFORTLESS APPLICATION - Smooth on with a caulking gun and get a fully dry, protective seal in just 48 hours.

Rentokil Mouse & Rat Gap Sealant is a 300ml waterproof, anti-chew sealant designed to block rodent entry points with a sticky core that deters gnawing. Easy to apply and fully dry in 48 hours, it offers a durable, poison-free barrier trusted by pest control experts for effective rodent prevention.

Specifications

ASIN	B01DKA14OW
Best Sellers Rank	5,366 in DIY & Tools ( See Top 100 in DIY & Tools ) 122 in Sealers
Customer Reviews	4.3 4.3 out of 5 stars (599)
Date First Available	29 Mar. 2016
Item model number	FMS01
Manufacturer	Rentokil
Part number	FMS01
Power source type	AC
Product Dimensions	5 x 5 x 23.5 cm; 240 g

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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