{"product_id":"waterco-trimline-mkiii-cartridge-filter-half-union-40-50mm-122257blk","title":"Waterco Trimline MkIII Cartridge Filter Half Union - 40\/50mm - 122257BLK","description":"\u003ch3\u003eWaterco Trimline MkIII Half Union - 40\/50mm\u003c\/h3\u003e\n\u003cp\u003eGenuine Waterco half union, part number 122257BLK, in black. This is the barrel union that connects the filter inlet or outlet to your pipework, supplied as the half union assembly. It takes either 40mm or 50mm pipe, so one part covers both plumbing sizes.\u003c\/p\u003e\n\u003cp\u003eThis is the post-2001 MkIII union. Replace it when the union nut has cracked, when the thread is stripped, or when the union weeps and a new o-ring has not fixed it.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e122257BLK\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer Description\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e40\/50mm Half Union MK3 (post-2001)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePipe Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e40mm or 50mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColour\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWaterco\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eQuantity Per Filter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2 — one inlet, one outlet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eFits\u003c\/h3\u003e\n\u003cp\u003eWaterco Trimline \u003cstrong\u003eMkIII\u003c\/strong\u003e cartridge filters manufactured from 2001 onward — C25, C50, C75, CC50, CC75, CC100.\u003c\/p\u003e\n\u003cp\u003eThe C100 and CC150 use a 40mm half union, part number 122243B. Pre-2001 MkII filters use a different union again, with union o-ring 620341. If you are not certain which you have, \u003ca href=\"mailto:info@hasp.com.au\"\u003esend us a photo\u003c\/a\u003e of the existing union before ordering.\u003c\/p\u003e\n\u003ch3\u003eFitting\u003c\/h3\u003e\n\u003cp\u003eA filter has two unions, inlet and outlet. If one has failed the other is usually the same age, so it is worth replacing both while the system is drained down rather than doing the job twice. Hand-tighten the union nut only — these seal on the o-ring face, not on thread tension, and overtightening cracks the nut.\u003c\/p\u003e\n\u003ch3\u003eRelated Trimline Parts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e122243B — 40mm half union, C100 and CC150\u003c\/li\u003e\n\u003cli\u003e620341 — Union o-ring, 40\/50mm MkII\u003c\/li\u003e\n\u003cli\u003e620342 — Half union o-ring, BS332 Viton\u003c\/li\u003e\n\u003cli\u003e62026 — MkIII lid o-ring, 214mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eManufacturer Manuals, Diagrams \u0026amp; Part Numbers\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eNeed exploded views, spare part numbers, diagrams, or more product information? See Waterco's \u003ca href=\"https:\/\/www.waterco.com.au\/waterco\/manuals\/pool-spa\/filters\/trimline-cartridge-filters-manual-_w99244.pdf\" rel=\"noopener\" target=\"_blank\"\u003eTrimline Cartridge Filter manual\u003c\/a\u003e.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"text-decoration: underline;\"\u003eImportant Before Ordering:\u003c\/span\u003e\u003c\/strong\u003e Please ensure you order correctly. Confirm this product is suitable before ordering. Use the manual above, seek professional assistance, or \u003ca href=\"mailto:info@hasp.com.au\"\u003econtact us\u003c\/a\u003e with photos of your existing part, model details, serial numbers, and any labels.\u003c\/p\u003e\n\u003cp\u003eAs with all products, these must be diagnosed and fitted by a qualified and experienced person.\u003c\/p\u003e\n\u003chr\u003e","brand":"Waterco","offers":[{"title":"Default Title","offer_id":48398234779837,"sku":"122257BLK","price":30.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0372\/5253\/files\/waterco-trimline-mkiii-cartridge-filter-half-union-40-50mm-122257blk-plumbing-fittings-379.webp?v=1788782947","url":"https:\/\/heaterandspaparts.com.au\/products\/waterco-trimline-mkiii-cartridge-filter-half-union-40-50mm-122257blk","provider":"Heater and Spa Parts","version":"1.0","type":"link"}