{"product_id":"underwater-junction-box-for-fountain-lights-easypro","title":"Underwater Junction Box for Fountain Lights – EasyPro","description":"\u003cp\u003eAn underwater junction box for fountain lights solves one of the most \ncommon wiring headaches in fountain installation: how do you safely connect multiple \nsubmersible lights to a single power supply without a tangle of exposed connections \nsitting on the pond floor? The EasyPro bronze junction box gives you a single sealed \nhub — all your light leads run into one corrosion-resistant bronze enclosure, filled \nwith potting compound, and locked watertight.\u003c\/p\u003e\n\n\u003ch2\u003eSmith Creek Field Notes\u003c\/h2\u003e\n\u003cp\u003eWhen we install pond and lake fountains here in New York, the junction box is one \nof those components people try to skip or substitute — and it's almost always where \nproblems start. Bronze matters here. We've pulled plastic alternatives out of ponds \nafter a single winter and they're cracked or corroded at every port. The bronze \nconstruction and compression-sealed ports on these EasyPro boxes hold up season \nafter season. Don't skip the potting compound either — it's not optional. A box \ninstalled dry will leak at the wire entries eventually. Fill it completely, let it \ncure, and you're done.\u003c\/p\u003e\n\n\u003ch2\u003eIs This Right for Your Pond Fountain?\u003c\/h2\u003e\n\n\u003cp\u003e✅ Use this underwater junction box for fountain lights if:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eYou're wiring 2–8 individual submersible lights to a single transformer or \n  power supply\u003c\/li\u003e\n  \u003cli\u003eYou want a clean, professional installation with a single sealed connection \n  point underwater\u003c\/li\u003e\n  \u003cli\u003eYou're mounting to a flange or base plate — choose the 1\" FPT bottom inlet \n  version (UJ4B or UJ8B)\u003c\/li\u003e\n  \u003cli\u003eYou're building a new fountain lighting display or upgrading existing wiring\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e⚠️ Keep in mind:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePotting compound (UJC) is required — the box is not waterproof without it\u003c\/li\u003e\n  \u003cli\u003eSide ports accept wires 3\/8\" diameter or smaller\u003c\/li\u003e\n  \u003cli\u003eChoose 4-outlet (UJ4\/UJ4B) for smaller displays; 8-outlet (UJ8\/UJ8B) for \n  larger multi-light setups\u003c\/li\u003e\n  \u003cli\u003eNot sure which configuration fits your project? Call us: (833) 326-5253\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eModel\u003c\/th\u003e\n      \u003cth\u003eOutlets\u003c\/th\u003e\n      \u003cth\u003eBottom Inlet\u003c\/th\u003e\n      \u003cth\u003eOverall Diameter\u003c\/th\u003e\n      \u003cth\u003eHeight\u003c\/th\u003e\n      \u003cth\u003eBody Diameter\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eUJ4\u003c\/td\u003e\n      \u003ctd\u003e4\u003c\/td\u003e\n      \u003ctd\u003eNone (solid bottom)\u003c\/td\u003e\n      \u003ctd\u003e5 1\/4\"\u003c\/td\u003e\n      \u003ctd\u003e1 7\/8\"\u003c\/td\u003e\n      \u003ctd\u003e4 1\/8\"\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eUJ4B\u003c\/td\u003e\n      \u003ctd\u003e4\u003c\/td\u003e\n      \u003ctd\u003e1\" FPT\u003c\/td\u003e\n      \u003ctd\u003e5 1\/4\"\u003c\/td\u003e\n      \u003ctd\u003e2 7\/8\"\u003c\/td\u003e\n      \u003ctd\u003e4 1\/8\"\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eUJ8\u003c\/td\u003e\n      \u003ctd\u003e8\u003c\/td\u003e\n      \u003ctd\u003eNone (solid bottom)\u003c\/td\u003e\n      \u003ctd\u003e6 3\/4\"\u003c\/td\u003e\n      \u003ctd\u003e2\"\u003c\/td\u003e\n      \u003ctd\u003e5 3\/4\"\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eUJ8B\u003c\/td\u003e\n      \u003ctd\u003e8\u003c\/td\u003e\n      \u003ctd\u003e1\" FPT\u003c\/td\u003e\n      \u003ctd\u003e6 3\/4\"\u003c\/td\u003e\n      \u003ctd\u003e2 7\/8\"\u003c\/td\u003e\n      \u003ctd\u003e5 3\/4\"\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eAll models: compression-sealed side ports, max wire diameter 3\/8\", \nbronze construction.\u003c\/p\u003e\n\n\u003ch2\u003eBottom Inlet vs. No Bottom Inlet — Which Do You Need?\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eno-inlet versions (UJ4, UJ8)\u003c\/strong\u003e have a solid bottom. All wire \nconnections — including your power feed — enter through the side compression ports. \nThis works well for standard installations where wiring runs horizontally along \nthe pond floor.\u003c\/p\u003e\n\n\u003cp\u003eThe \u003cstrong\u003ebottom inlet versions (UJ4B, UJ8B)\u003c\/strong\u003e have a 1\" female pipe \nthread (FPT) opening in the base. This lets you mount the box directly onto a bronze \nflange (such as the EasyPro BWF10), with power feed rising up through the bottom and \nlight leads entering from the sides. This is the cleaner, more professional choice \nfor permanent fountain installations.\u003c\/p\u003e\n\n\u003ch2\u003eRequired: Potting Compound\u003c\/h2\u003e\n\u003cp\u003eThe EasyPro UJC Flexible Potting Compound is the only recommended method for \nsealing this underwater junction box for fountain lights. Once your wires are \nconnected and routed, fill the box completely before closing. The re-enterable \nformula behaves similarly to silicone caulk — it can be removed and reworked if \nyou need to adjust wiring later. Each 385 mL container fills one UJ8 or UJ8B box, \nor two UJ4 or UJ4B boxes. Butyl tape is included with the compound to seal any \nunused ports. The UJC potting compound is available as a separate variant on \nthis page.\u003c\/p\u003e\n\n\u003ch2\u003ePair With Fountain Lighting\u003c\/h2\u003e\n\u003cp\u003eThis junction box is a wiring component — you'll need submersible light fixtures \nto go with it. Browse our full \n\u003ca href=\"\/collections\/pond-lake-fountain-lighting\"\u003epond and lake fountain lighting \ncollection\u003c\/a\u003e, including the \n\u003ca href=\"\/products\/color-changing-fountain-light-kit-1\"\u003eEasyPro color changing \nfountain light kit\u003c\/a\u003e and the \n\u003ca href=\"\/products\/stainless-steel-led-warm-white-light-kits-for-fountains\"\u003eEasyPro \nstainless steel LED fountain light kit\u003c\/a\u003e. Also explore our \n\u003ca href=\"\/collections\/pond-lake-fountains\"\u003epond and lake fountains collection\u003c\/a\u003e \nand \u003ca href=\"\/collections\/pond-lake-fountain-nozzles-parts\"\u003efountain nozzles and \nparts\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003ch3\u003eWhat is an underwater junction box for fountain lights used for?\u003c\/h3\u003e\n\u003cp\u003eAn underwater junction box for fountain lights consolidates the wiring from \nmultiple submersible fixtures into a single sealed enclosure. Instead of running \neach light's lead all the way back to a transformer, you join them at a central hub \nunderwater — fewer exposed connections, cleaner installation, and one sealed \nwatertight point to maintain.\u003c\/p\u003e\n\n\u003ch3\u003eDo I need potting compound to make the junction box waterproof?\u003c\/h3\u003e\n\u003cp\u003eYes — the box is not watertight without it. EasyPro states that potting compound \nis the only recommended means of creating a watertight seal. The UJC compound is \nsold separately and is available as a variant on this page.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's the difference between the UJ4 and UJ8?\u003c\/h3\u003e\n\u003cp\u003eThe UJ4 has 4 outlet ports for smaller displays with up to 4 lights. The UJ8 has \n8 outlet ports for larger multi-light installations. Both are available with or \nwithout a 1\" threaded bottom inlet.\u003c\/p\u003e\n\n\u003ch3\u003eWhen should I choose the bottom inlet version (UJ4B or UJ8B)?\u003c\/h3\u003e\n\u003cp\u003eChoose the bottom inlet version when mounting the box onto a bronze flange such \nas the EasyPro BWF10, with your power feed entering from below. It creates a cleaner \ninstallation and is the preferred option for permanent fountain builds. Note that the \nbottom inlet versions are taller — 2 7\/8\" vs 1 7\/8\" for the 4-outlet models, and \n2 7\/8\" vs 2\" for the 8-outlet models — so factor that into your mounting plan.\u003c\/p\u003e\n\n\u003ch3\u003eWhat size wires fit through the compression ports?\u003c\/h3\u003e\n\u003cp\u003eThe side compression ports accept wires up to 3\/8\" in diameter. Standard \nsubmersible fountain light cables fit without issue.\u003c\/p\u003e\n\n\u003ch3\u003eCan I reopen the junction box after filling it with potting compound?\u003c\/h3\u003e\n\u003cp\u003eYes. The EasyPro UJC compound is re-enterable — it can be cut out or removed if \nyou need to change wiring. It's not a permanent epoxy. Once you've made adjustments, \nrefill with fresh compound to reseal.\u003c\/p\u003e\n\n\u003ch3\u003eHow much potting compound do I need?\u003c\/h3\u003e\n\u003cp\u003eOne 385 mL UJC container fills one UJ8 or UJ8B box, or two UJ4 or UJ4B boxes. \nOrder accordingly if you're installing multiple junction boxes on the same project.\u003c\/p\u003e\n\n\u003ch3\u003eIs this junction box compatible with all EasyPro fountain lights?\u003c\/h3\u003e\n\u003cp\u003eYes — this is the EasyPro-designed wiring hub for their underwater lighting \nsystems. It's also compatible with other brands as long as wire diameter is 3\/8\" \nor smaller.\u003c\/p\u003e\n\n\u003ch3\u003eCan I use this above water or in outdoor above-grade installations?\u003c\/h3\u003e\n\u003cp\u003eThese boxes are designed for submersible underwater use, but the bronze \nconstruction and compression-sealed ports make them suitable for any wet outdoor \nenvironment. Always fill with potting compound regardless of installation \nlocation for a proper weatherproof seal.\u003c\/p\u003e\n\n\u003ch3\u003eDoes the junction box come with anything, or do I need to buy accessories \nseparately?\u003c\/h3\u003e\n\u003cp\u003eThe junction box itself is included. Butyl tape to seal unused ports comes with \nthe UJC potting compound kit. The potting compound is required for a waterproof \ninstallation and is available as a variant on this page.\u003c\/p\u003e\n\n\u003ch2\u003eSeasonal Notes\u003c\/h2\u003e\n\n\u003ch3\u003eSpring\u003c\/h3\u003e\n\u003cp\u003eWhen bringing your fountain system back online after winter, inspect the junction \nbox before powering up. Check that the potting compound seal is intact at all wire \nentries and that no ports have shifted. Bronze holds up through freeze-thaw cycles, \nbut a quick visual check before the season starts is good practice.\u003c\/p\u003e\n\n\u003ch3\u003eSummer\u003c\/h3\u003e\n\u003cp\u003ePeak season for fountain operation. Once installed and sealed, the junction box \nrequires no maintenance. If you're adding lights mid-season, the re-enterable \npotting compound makes it easy to open, add a wire, and reseal without \npulling the entire system.\u003c\/p\u003e\n\n\u003ch3\u003eFall\u003c\/h3\u003e\n\u003cp\u003eIf shutting down your fountain for winter, remove the junction box if possible \nand store it dry. Inspect the compound seal and address any loose ports before \nputting it back in service next spring.\u003c\/p\u003e\n\n\u003ch3\u003eWinter\u003c\/h3\u003e\n\u003cp\u003eWater trapped inside an unsealed box will expand when it freezes and can crack \nports or push seals loose. Always ensure the box is fully filled with potting \ncompound before leaving it submerged through winter — or remove it entirely \nduring off-season storage.\u003c\/p\u003e\n\n\u003ch2\u003eBrowse Related Products\u003c\/h2\u003e\n\u003cp\u003eShop our full \u003ca href=\"\/collections\/pond-lake-fountain-lighting\"\u003epond and lake \nfountain lighting collection\u003c\/a\u003e, explore \n\u003ca href=\"\/collections\/pond-lake-fountain-nozzles-parts\"\u003efountain nozzles and \nparts\u003c\/a\u003e, or browse all \n\u003ca href=\"\/collections\/pond-lake-fountains\"\u003epond and lake fountain systems\u003c\/a\u003e. \nQuestions? Call us at (833) 326-5253.\u003c\/p\u003e","brand":"EasyPro","offers":[{"title":"Four outlet junction box (no bottom inlet)","offer_id":33782164979809,"sku":"UJ4","price":161.49,"currency_code":"USD","in_stock":true},{"title":"Four outlet junction box (1\" fpt bottom inlet)","offer_id":33782165012577,"sku":"UJ4B","price":183.34,"currency_code":"USD","in_stock":true},{"title":"Eight outlet junction box (no bottom inlet)","offer_id":33782165045345,"sku":"UJ8","price":275.49,"currency_code":"USD","in_stock":true},{"title":"Eight outlet junction box (1\" fpt bottom inlet)","offer_id":33782165078113,"sku":"UJ8B","price":294.49,"currency_code":"USD","in_stock":true},{"title":"Flexible Potting Compound (Must be used to make a waterproof connection)","offer_id":33782165110881,"sku":"UJC","price":66.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0260\/2126\/5505\/files\/bronze-underwater-electric-junction-box-easypro-2268814.jpg?v=1780597586","url":"https:\/\/smithcreekfishfarm.com\/products\/underwater-junction-box-for-fountain-lights-easypro","provider":"Smith Creek Fish Farm","version":"1.0","type":"link"}