{"product_id":"waterco-half-barrel-unions-50mm","title":"Waterco Half Barrel Unions - 50mm","description":"\u003ch3\u003eWaterco Half Barrel Union - 50mm\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eGenuine Waterco 50mm half barrel union\u003c\/strong\u003e, comprising the threaded locking nut, the glue-in tail piece and the union O-ring. Waterco part number \u003cstrong\u003e634024B\u003c\/strong\u003e (also listed as \u003cstrong\u003e1533537\u003c\/strong\u003e, \u003cstrong\u003e634024BLK\u003c\/strong\u003e). This is the standard 50mm union used across most of the Waterco pump range, plus Waterco filters, multiport valves and the Aquaswim, Baker-Hydro, Lacron Grange and Maxi Grange badged equivalents.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003e\u003cstrong\u003ePhysically Stocked, unlike most \"drop-shipping\" websites.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003e\u003cstrong\u003eShipped from VIC, NSW, WA, QLD\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x threaded barrel union locking nut\u003c\/li\u003e\n\u003cli\u003e1 x glue-in tail piece (solvent weld to 50mm PVC pressure pipe)\u003c\/li\u003e\n\u003cli\u003e1 x union O-ring\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eQuick Size Check\u003c\/h3\u003e\n\u003cp\u003eThis is the \u003cstrong\u003e50mm\u003c\/strong\u003e union. The glue socket accepts 50mm PVC pressure pipe, which has an actual \u003cstrong\u003eoutside diameter of around 60mm\u003c\/strong\u003e — not 50mm. If the pipe going into your existing union measures roughly 60mm across the outside, this is the correct size. If it measures around 48mm OD you have 40mm pipe and need the 40mm union instead. Measure the pipe, not the union nut.\u003c\/p\u003e\n\u003ch3\u003eCompatible Waterco Pumps\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eSupastream range\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupastream \u003c\/strong\u003e50, 75, 100, 125, 150 — 50mm port models (WFE1)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAquaswim Series 40S\u003c\/strong\u003e — same pump, Aquaswim badging\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLacron Grange\u003c\/strong\u003e — same pump, Lacron badging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSupatuf range\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupatuf \u003c\/strong\u003e75, 100, 125, 150, 200, 250, 300\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupatuf \u003c\/strong\u003eEco 100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAquaswim Series 50\u003c\/strong\u003e — same pump, Aquaswim badging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eHydrotuf range\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydrotuf \u003c\/strong\u003e100, 125, 150, 200\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eHydrostorm range\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydrostorm \u003c\/strong\u003e75, 100, 125, 150, 200, 250, 300, 350\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydrostorm\u003c\/strong\u003e Eco 100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydrostorm \u003c\/strong\u003eEco-V 100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydrostorm \u003c\/strong\u003eEco-V 150\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHydrostorm Plus \u003c\/strong\u003e100, 125, 150, 200, 250\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAquaswim Series 50T\u003c\/strong\u003e — same pump, Aquaswim badging\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaxi Grange\u003c\/strong\u003e — same pump, Lacron badging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eTurboflo range\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eTurboflo 100, 125, 150, 200, 250, 300, 400\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eBaker-Hydro badged pumps\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWaterco pumps sold under the \u003cstrong\u003eBaker-Hydro\u003c\/strong\u003e brand share the same 50mm pump body and union. If your Baker-Hydro pump has a 50mm threaded port with a barrel union, this is the correct part.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatible Waterco Filters, Valves \u0026amp; Equipment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e50mm multiport valves\u003c\/strong\u003e — Waterco top mount 228053 and 228058, side mount 2290512\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMicron side mount sand filters\u003c\/strong\u003e — 50mm port models\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMicron side mount commercial filters\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eSMD \/ SMDD side mount deep bed filters\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermoplastic and Hydron filters\u003c\/strong\u003e using the 50mm common parts group\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFulflo Tri Cartridge filters\u003c\/strong\u003e — TC300, TC400, TC500\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFulflo \/ Astra D.E. filters\u003c\/strong\u003e — P2027, P2031, P2036, P2048\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eLeaf Trapper\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWill NOT Fit — Check Your Port Size First\u003c\/h3\u003e\n\u003cp\u003eWaterco uses a different union at every port size, and they are not interchangeable. If yours is not 50mm, you need one of these instead:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e40mm\u003c\/strong\u003e — part 122243B. \u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/waterco-half-barrel-unions-40mm-50mm\" title=\"Waterco 40mm Half Barrel Union\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eClick here for the Waterco 40mm half barrel union\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50mm x 40mm reducing\u003c\/strong\u003e — parts 122257BLK \/ 634024542, used where a 50mm port is plumbed down to 40mm pipe\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e65mm x 50mm\u003c\/strong\u003e — part 63406550BLK, used on Hydrostar 200–350, Hydrostorm Plus 300–400 and Supaflo\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e80mm\u003c\/strong\u003e — part 6340803, used on Hydrosteel and Hydrostar Commercial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e100mm\u003c\/strong\u003e — part 6340801, used on large commercial filters and Hydron\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eAlso not this part:\u003c\/strong\u003e Opal and Opal XL cartridge filters use their own union set (AXFI014 tail, AXFI016 lock ring, AXFI018 O-ring). Large Baker-Hydro commercial strainer housings use 4\" and 6\" flanged connections rather than a barrel union. Portapac and Aquastream Solar use the 50\/40mm S13185A union.\u003c\/p\u003e\n\u003ch3\u003ePart Numbers \u0026amp; Search References\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e634024B (current Waterco part number)\u003c\/li\u003e\n\u003cli\u003e634024BLK\u003c\/li\u003e\n\u003cli\u003e1533537\u003c\/li\u003e\n\u003cli\u003eWC634024BLK (Waterco USA reference)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnion O-ring only:\u003c\/strong\u003e 6340241 — BS332 \/ P2027-48\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLocking nut only:\u003c\/strong\u003e 6340242B\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCommon search terms:\u003c\/strong\u003e Waterco 50mm half union, Waterco barrel union 50mm, Waterco pump union kit, Hydrostorm union, Supatuf union, Hydrotuf union, Turboflo union, Lacron Grange union, Baker-Hydro pump union, Aquaswim union, 634024B, Waterco 2 inch half union with o-ring, Waterco pump tail piece and nut.\u003c\/p\u003e\n\u003ch3\u003eUnderstanding 50mm Nominal Sizing\u003c\/h3\u003e\n\u003cp\u003eIn plumbing, named sizes are not measured sizes. A pipe called \"50mm\" or \"2 inch\" does not measure 50mm across — it follows nominal sizing, an internationally standardised naming convention. 50mm PVC pressure pipe has an outside diameter of approximately 60mm. Always use the OD of the pipe to confirm the fitting size.\u003c\/p\u003e\n\u003ch3\u003eFitting Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSolvent weld the tail piece to 50mm PVC pressure pipe using an approved priming fluid and PVC cement. Allow full cure before pressurising.\u003c\/li\u003e\n\u003cli\u003eSeat the O-ring in the tail groove and lubricate with a silicone-based lubricant only. Petroleum jelly and mineral greases swell and destroy the rubber.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHand tighten the nut only.\u003c\/strong\u003e These unions seal on the O-ring face, not on thread compression. Multi-grips and pipe wrenches crack the nut and do not improve the seal.\u003c\/li\u003e\n\u003cli\u003eIf a union weeps after tightening, the cause is almost always a nicked, flattened or dirty O-ring, or grit on the sealing face — not insufficient torque.\u003c\/li\u003e\n\u003cli\u003eSupport the pump and pipework so the unions are not carrying pipe weight or misalignment. Side load is the most common cause of a cracked union nut.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy Replace A Barrel Union?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCracked or split locking nut, usually from over-tightening or UV embrittlement\u003c\/li\u003e\n\u003cli\u003ePersistent weeping at the pump inlet or outlet\u003c\/li\u003e\n\u003cli\u003eAir being drawn in on the suction side, causing loss of prime or a pump that will not hold water\u003c\/li\u003e\n\u003cli\u003eStripped or cross-threaded nut that will no longer pull up square\u003c\/li\u003e\n\u003cli\u003eDamaged tail piece sealing face\u003c\/li\u003e\n\u003cli\u003eRetrofitting a new pump onto existing pipework\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA weeping union on the suction side is worth attending to promptly. It draws air rather than leaking water, so there is no puddle to warn you, and running a pump with entrained air will damage the mechanical seal.\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow many do I need?\u003c\/strong\u003e\u003cbr\u003eTwo for a complete pump changeover — one per port. One only if you are replacing a single failed side.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it include the O-ring?\u003c\/strong\u003e\u003cbr\u003eYes. The union O-ring (6340241) is supplied with it. You can also buy that O-ring separately if the nut and tail are still sound.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know I need the 50mm and not the 40mm?\u003c\/strong\u003e\u003cbr\u003eMeasure the outside diameter of the pipe entering the union. Around 60mm OD is 50mm pipe and takes this union. Around 48mm OD is 40mm pipe and takes part 122243B.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it fit my Baker-Hydro pump?\u003c\/strong\u003e\u003cbr\u003eYes, if it is one of the Waterco pumps sold under the Baker-Hydro brand with a 50mm barrel union port. The pump bodies are shared, so the union is the same. Large Baker-Hydro commercial strainers are flanged and use a different connection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill it fit my non-Waterco pump?\u003c\/strong\u003e\u003cbr\u003eOnly if that pump was built on a Waterco body. Aquaswim, Baker-Hydro, Lacron Grange and Maxi Grange are re-badged Waterco pumps and do fit. Other brands use their own thread forms — an Astralpool, Onga, Davey or Poolrite 50mm union is not interchangeable with this one even though the pipe size matches.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMy pump is 50mm but the old union looks different.\u003c\/strong\u003e\u003cbr\u003eWaterco revised the union around 2001. Compare the nut thread and the tail length before ordering, and send us a photo if you are unsure.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use thread tape on it?\u003c\/strong\u003e\u003cbr\u003eNo. The seal is made by the O-ring against the port face. Tape on the barrel thread does nothing useful and can prevent the nut pulling up square.\u003c\/p\u003e\n\u003ch3\u003eNot Sure Which One You Need?\u003c\/h3\u003e\n\u003cp\u003eSend us a photo of your pump label and the existing union and we will confirm the correct part and quantity. Waterco has used at least six different union sizes across their range, and the wrong one is a wasted trip.\u003c\/p\u003e\n\u003ch3\u003eManufacturer Catalogues, Diagrams \u0026amp; Part Numbers\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eNeed exploded views, spare part numbers, product numbers, diagrams, or more product information?\u003c\/strong\u003e See the manufacturer catalogue: \u003ca href=\"https:\/\/hasp.com.au\/pages\/Waterco_Catalogue_2026\"\u003eWaterco Catalogue 2026\u003c\/a\u003e\u003c\/p\u003e","brand":"Waterco","offers":[{"title":"Default Title","offer_id":44936479637693,"sku":"r 1533537 \/ 634024B","price":72.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0372\/5253\/files\/waterco-half-barrel-unions-50mm-221.webp?v=1763605031","url":"https:\/\/heaterandspaparts.com.au\/en-nz\/products\/waterco-half-barrel-unions-50mm","provider":"Heater and Spa Parts","version":"1.0","type":"link"}