{"product_id":"13mm-iws-fittings","title":"13mm IWS Fittings","description":"\u003csection class=\"gh-product-listing\"\u003e\n\u003ch2\u003e13mm IWS Fittings — Genuine Hydroponic System Components for Flood and Drain Setup\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBest for:\u003c\/strong\u003e IWS system owners needing spares, growers scaling their setup, and DIY hydroponic builders who want proven components that actually fit properly\u003c\/p\u003e\n\u003cdiv class=\"gh-our-thoughts\" role=\"note\" aria-label=\"Our thoughts\"\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eOur thoughts\u003c\/strong\u003e\u003cbr\u003eIf you're running an IWS system or building something custom, you need fittings that seal tight and don't leak all over your grow space. These are the genuine parts — barbed, reliable, and designed to work with 13mm flexi-pipe. One we recommend for anyone who's had to bodge a connection with generic bits.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e13mm IWS fittings are \u003cstrong\u003egenuine hydroponic system components\u003c\/strong\u003e designed to connect, redirect, and control nutrient solution flow in flood and drain setups. Whether you're replacing damaged piping, extending your system, or building a custom hydroponic solution from scratch, these barbed fittings create secure, water-tight connections with 13mm flexi-pipe (16mm outer diameter). The range includes universal tees, straight connectors, elbows, anti-siphon valves, and specialist inserts — everything you need to keep your system running leak-free.\u003c\/p\u003e\n\u003ch3\u003eHow it compares\u003c\/h3\u003e\n\u003cp\u003eIWS fittings sit at the \u003cstrong\u003epremium end of the 13mm barbed fitting market\u003c\/strong\u003e because they're designed specifically for proven hydroponic systems, not generic plumbing.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine IWS parts with 20-year brand heritage in UK hydroponics\u003c\/li\u003e\n\u003cli\u003eBetter fit tolerance than cheap generic barbed fittings — less leaking, less bodging\u003c\/li\u003e\n\u003cli\u003eCompatible with IWS systems, RTA, Multiflow, and DIY custom builds\u003c\/li\u003e\n\u003cli\u003eSpecialist options (anti-siphon valves, copper root control inserts) that generic ranges don't offer\u003c\/li\u003e\n\u003cli\u003eUK-manufactured with proper support if something goes wrong\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIn plain terms: you're buying compatibility and peace of mind, not just plastic bits.\u003c\/p\u003e\n\u003ch3\u003eUsage guidance\u003c\/h3\u003e\n\u003cp\u003eIWS fittings are dead simple to install once you know the method:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBasic installation\u003c\/strong\u003e\u003cbr\u003eCut your 13mm flexi-pipe to length using pipe cutters or sharp scissors. Warm the cut end in hot water for 10-15 seconds to soften it, then push the fitting barb in firmly. Insert the fitted end into your sealing gland and tighten down. Tighten hose clips around the connection to guarantee a water-tight seal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eConnecting the system\u003c\/strong\u003e\u003cbr\u003eUse straight pieces to link the brain-pot to outer-pots. Deploy tees and elbows to split flows and change direction without kinking or restricting the pipe. The swivel elbow is especially useful if you need to route pipework around obstacles without bending or pinching the line.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAnti-siphon valve setup\u003c\/strong\u003e\u003cbr\u003eFit an anti-siphon valve at the end of longer piping runs to stop water flowing backwards once your pump shuts off. This prevents air locks and ensures every plant gets the full programmed feed, every time.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRoot clogging prevention\u003c\/strong\u003e\u003cbr\u003eIf you're running in a system where roots can reach the irrigation pipes (common in larger setups), fit a copper root control insert into your sealing gland. Copper naturally repels root growth and keeps your lines clear without chemicals.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eScaling and customisation\u003c\/strong\u003e\u003cbr\u003eThe IWS system is fully modular. Add pots, remove pots, rearrange them — the fittings stay the same. This is why growers favour IWS for long-term setups. Buy the fittings as you expand.\u003c\/p\u003e\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePipe size: \u003cstrong\u003e13mm barbed (16mm outer diameter flexi-pipe)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eSealing gland hole size: \u003cstrong\u003e25mm\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eMaterial: \u003cstrong\u003eDurable plastic (barbed fittings), copper (root control inserts)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eFitting types available: \u003cstrong\u003eUniversal tee, straight connector, universal elbow, swivel elbow, female hose tail barred, anti-siphon valve, copper root control insert\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eInstallation: \u003cstrong\u003eBarbed end into heated pipe, smooth end into sealing gland\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eRecommended accessories: \u003cstrong\u003eHose clips for leak prevention\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCompatible systems: \u003cstrong\u003eIWS standard systems, RTA, Multiflow, DIY custom builds\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWho this is for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eExisting IWS system owners replacing lost, damaged, or worn fittings\u003c\/li\u003e\n\u003cli\u003eGrowers scaling up their IWS setup with additional outer-pots\u003c\/li\u003e\n\u003cli\u003eDIY hydroponic builders who want proven components with proper fit tolerance\u003c\/li\u003e\n\u003cli\u003eCommercial or semi-professional growers building custom flood and drain solutions\u003c\/li\u003e\n\u003cli\u003eAnyone tired of cheap generic fittings that leak and need constant re-sealing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eParticularly valuable if you're \u003cstrong\u003escaling a system over time or maintaining one that's running 24\/7\u003c\/strong\u003e — genuine parts mean fewer leaks and less downtime.\u003c\/p\u003e\n\u003ch3\u003eOur take\u003c\/h3\u003e\n\u003cp\u003eThese are proper hydroponic fittings from a brand that's been building reliable watering systems for 20 years. You're not paying for the name — you're paying for fit tolerance, compatibility, and specialist options that a generic barbed fitting simply doesn't offer.\u003c\/p\u003e\n\u003cp\u003eIf you've got an IWS system or you're building something custom and want fittings that seal tight first time, worth picking up. Better yet, buy them before you need them in an emergency. Good time to grab spares while stock lasts.\u003c\/p\u003e\n\u003c\/section\u003e","brand":"13MM FITTINGS","offers":[{"title":"Copper Root Control Insert","offer_id":47916238930090,"sku":"89261","price":3.49,"currency_code":"GBP","in_stock":true},{"title":"IWS Tee Piece","offer_id":47916238962858,"sku":"89259","price":0.99,"currency_code":"GBP","in_stock":true},{"title":"IWS Straight Piece","offer_id":47916238995626,"sku":"89248","price":0.99,"currency_code":"GBP","in_stock":true},{"title":"IWS Elbow Piece","offer_id":47916239028394,"sku":"89260","price":0.99,"currency_code":"GBP","in_stock":true},{"title":"IWS Sealing Gland","offer_id":47916239061162,"sku":"262","price":1.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0053\/5540\/5400\/files\/13mm.jpg?v=1769189781","url":"https:\/\/growershouse.co.uk\/products\/13mm-iws-fittings","provider":"Growers House ","version":"1.0","type":"link"}