--- product_id: 411231093 title: "Kair Straight 125mm to 100mm Ducting Reducer/Adaptor - SYS-125 / SYS-100 - DUCVKC603 by Kair" brand: "kair" price: "€ 44.99" currency: EUR in_stock: true reviews_count: 5 category: "Kair" url: https://www.desertcart.hr/products/411231093-kair-straight-125mm-to-100mm-ducting-reducer-adaptor-sys-125 store_origin: HR region: Croatia --- # 125mm to 100mm precision fit Universal compatibility with SYS-100 & SYS-125 Made in the UK, premium quality plastic Kair Straight 125mm to 100mm Ducting Reducer/Adaptor - SYS-125 / SYS-100 - DUCVKC603 by Kair **Brand:** kair **Price:** € 44.99 **Availability:** ✅ In Stock ## Summary > 🔧 Upgrade your airflow game with precision and ease! ## Quick Answers - **What is this?** Kair Straight 125mm to 100mm Ducting Reducer/Adaptor - SYS-125 / SYS-100 - DUCVKC603 by Kair by kair - **How much does it cost?** € 44.99 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/411231093-kair-straight-125mm-to-100mm-ducting-reducer-adaptor-sys-125) ## Best For - kair enthusiasts ## Why This Product - Trusted kair brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Durable UK Craftsmanship:** High-quality polystyrene/polypropylene ensures longevity and reliability. - • **Seamless Size Transition:** Effortlessly adapts 125mm ducting to 100mm for perfect airflow. - • **Plug & Play Compatibility:** Fits over push-fit connectors and straight ducts in the extensive Kair range. - • **Quick Fix for Complex Setups:** Avoid costly renovations with this easy-to-install ducting reducer. - • **Versatile Ventilation Solution:** Ideal for tumble dryers, extractor fans, hydroponics, and HVAC systems. ## Overview The Kair Straight 125mm to 100mm Ducting Reducer/Adaptor (DUCVKC603) is a high-quality UK-made plastic fitting designed to seamlessly connect 125mm female spigots to 100mm male ducting. Compatible with Kair’s SYS-100 and SYS-125 ducting systems, it supports a wide range of ventilation applications including tumble dryers, extractor fans, and HVAC setups. Lightweight and durable, it simplifies duct transitions while ensuring a secure, professional fit. ## Description Kair 125mm Female to 100mm Male Round Ducting Adaptor. Made in the UK using high-quality white Polystyrene/Polypropylene plastic Material. Max / Min Temperature: +60c / -15c; On one side there is a 125mm Female Spigot - Will fit over male fittings (bends etc). Rigid round 125mm ducting pipe (Part: DUCVKC267) will require a male connector / coupling (Part: DUCVKC355). 127mm Flexible ducting (Part: DUCP0092/127/35) will fit over and require tape or metal hose clips (Part: DUCVKC611) to seal. ;On the other side there is a 100mm male spigot - will fit into 100mm straight ducting (part: DUCVKC250). Can be used with rigid plastic ducting systems - seal with mastic or tape. Can be used with flexible ducting systems with use of metal hose clips (Part: DUCVKC264). Kair plastic rigid ducting is perfect for DIY and trade use. Perfectly suited for ducting your Tumble Dryer, Bathroom or Kitchen extractor fan, Hydroponics, In-Line Extract Fans, or Cooker Hood. This reducer can be used as a part of a long ductwork run for a variety of purposes including whole house ventilation, passive stack vent, positive input, air conditioning, HVAC, and Heat Recovery Systems. ;Genuine Kair Product & covered by the Kair 100% Satisfaction Guarantee for your peace of mind. Made in the UK. Compatible with the extensive Kair SYS-100 & SYS-125 range of fittings, outlets, and grilles. Search for Kair SYS-100 Ducting for the full range of Kair 100mm Round and 110mm x 54mm Rectangular Ducting Products. Search for Kair SYS-125 for the full range of Kair Rectangular 150mm x 70mm and 125mm Round ducting products. Review: il riduttore è un pezzo molto semplice ma trovarlo in giro diventa complicato i negozi non lo tengono e tanto meno le ferramente, qui è diventato tutto semplice e si adatta perfettamente ai tubi da ridurre Review: On avait pas ce produit en quincaillerie. J avais acheté une hotte et oh non!! Les normes ont changées. La solution était de repercer un mur de 1.5 m en briques ( des heures de travail😣) au dernier moment j ai penser à desertcart et 8.00€ et 1 jour plus tard ma hotte est poser et en état de fonctionnement.😥 ## Features - Adapter to convert 125mm to 100mm ducting - 5" to 4" - On one side there is a 125mm female spigot. Fits over push-fit connectors (bends, etc.) Requires an additional 125mm plug to connect round 125mm pipe. - On the other side there is a 100mm spigot. Fits in 100mm straight ducting - Compatible with 100mm and 125mm ducting systems, including the extensive Kair SYS-100 and SYS-125 range of fittings, sockets and grilles. - Perfectly suited for conducting your tumble dryer, bathroom or kitchen extractor fan, hydroponics, in-line fans or cooker hoods and other ventilation applications. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B004X4S7QI | | ASIN | B004X4S7QI | | Best Sellers Rank | #46,670 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #40 in Heating & Cooling Ducting Products | | Brand Name | Kair | | Color | White | | Connector Type | Reducer | | Customer Reviews | 4.5 4.5 out of 5 stars (2,517) | | Customer reviews | 4.5 4.5 out of 5 stars (2,517) | | Date First Available | 30 November 2012 | | Item Dimensions | 5.1 x 5.1 centimeters | | Item Weight | 41 g | | Item model number | DUCVKC603 | | Manufacturer | Kair | | Manufacturer | Kair | | Material Type | Plastic | | Model Number | DUCVKC603 | | Number of Pieces | 1 | | Product Dimensions | 5.08 x 5.08 x 0.01 cm; 40.82 g | | Size | Klein | | Thread Size | 125mm, 100mm | | Unit Count | 1 Count | ## Product Details - **Brand:** Kair - **Colour:** White - **Item dimensions L x W x H:** 5.1 x 5.1 centimeters - **Material:** Plastic - **Size:** Klein ## Images ![Kair Straight 125mm to 100mm Ducting Reducer/Adaptor - SYS-125 / SYS-100 - DUCVKC603 by Kair - Image 1](https://m.media-amazon.com/images/I/415Hw3eWTlL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by B***O on 10 May 2016* il riduttore è un pezzo molto semplice ma trovarlo in giro diventa complicato i negozi non lo tengono e tanto meno le ferramente, qui è diventato tutto semplice e si adatta perfettamente ai tubi da ridurre ### ⭐⭐⭐⭐⭐ Review *by D***A on 12 June 2018* On avait pas ce produit en quincaillerie. J avais acheté une hotte et oh non!! Les normes ont changées. La solution était de repercer un mur de 1.5 m en briques ( des heures de travail😣) au dernier moment j ai penser à Amazon et 8.00€ et 1 jour plus tard ma hotte est poser et en état de fonctionnement.😥 ### ⭐⭐⭐⭐⭐ Review *by F***I on 16 February 2018* Il pezzo è perfettamente in accordo alla descrizione e rispetta le aspettative. Buona sia manifattura che i materiali utilizzati. Lato 125mm il componente ha la dimensione del tubo, quindi per una eventuale connessione ad un tubo occorre prevedere un raccordo. ## Frequently Bought Together - Kair Straight Ducting Reducer/Adaptor - SYS-125 / SYS-100 - DUCVKC603 125 mm to 100 mm Kair - Kair PVC Flexible Hose 125mm - 5 inch Universal Tumble Drier, Cooker Hood, Extractor Fan, Air Conditioner Hose - 3 Metre Length - 125mm Pack of 2 Adjustable 120-140mm Stainless Steel Pipe Clamp Secure Hose Clip Inline Duct Extractor Fan Cooker Hood --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/411231093-kair-straight-125mm-to-100mm-ducting-reducer-adaptor-sys-125](https://www.desertcart.hr/products/411231093-kair-straight-125mm-to-100mm-ducting-reducer-adaptor-sys-125) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-07-07*