{"product_id":"lock-ring-zx-filter-graphpearl","title":"Astralpool \/ Zodiac Lock Ring ZX Filter Graphpearl 7820002","description":"\u003c!-- HASP-FLP-1.0 | SKU 7820002 | product ZX lock ring | rule ZXL-1.0 | canary: zx-lockring-echo-7820002 --\u003e\u003ch3\u003eAstralpool ZX \/ Zodiac ZXC Cartridge Filter Locking Ring (Lock Nut) — 7820002\u003c\/h3\u003e\u003cp\u003eThis is the genuine Astralpool \u003cstrong\u003elocking ring\u003c\/strong\u003e (lock nut) for the \u003cstrong\u003eZX-family cartridge filter\u003c\/strong\u003e, part number \u003cstrong\u003e7820002\u003c\/strong\u003e. It is the large threaded ring that clamps the filter lid down onto the tank — supplied on its own, to replace a ring that is cracked, cross-threaded, seized or grinding rather than turning smoothly. One ring fits every filter in the ZX range, from the ZX50 to the ZX310.\u003c\/p\u003e\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\u003cp\u003eThis is the same filter sold under several brands — Astralpool ZX, Hurlcon ZX, \u003cstrong\u003eZodiac ZXC\u003c\/strong\u003e, Zodiac ZCF \/ Titan ZCF, Astral SMART, Filtrite CF and Aquatight. The Zodiac ZXC is simply the Zodiac-badged Astralpool ZX. Ring colour has changed across production runs (grey, graphite \/ graphpearl, black); current production is black and the fit and thread are unchanged.\u003c\/p\u003e\u003ch3\u003eIs This Your Ring? — The 290mm ZX Check\u003c\/h3\u003e\u003cp\u003eOne locking ring fits the whole ZX family, so there is no size to choose — but confirm you have a ZX filter and not a look-alike:\u003c\/p\u003e\u003col\u003e\n\u003cli\u003eThe ZX lid and ring measure about \u003cstrong\u003e290mm\u003c\/strong\u003e across. If your ring is roughly 290mm, this fits.\u003c\/li\u003e\n\u003cli\u003eIf it measures about \u003cstrong\u003e222mm\u003c\/strong\u003e you have the smaller \u003cstrong\u003eHurlcon QX\u003c\/strong\u003e, which uses a different ring and will not fit.\u003c\/li\u003e\n\u003c\/ol\u003e\u003cp\u003eMeasure across the widest point of the ring, not the tank rim.\u003c\/p\u003e\u003ch3\u003eWorked Example\u003c\/h3\u003e\u003cp\u003eA customer's ZX150 ring has gone brittle and split a lug, so it no longer tightens. They measure it at 291mm — a ZX, not a QX — so this 7820002 ring is correct. Because the split let the lid weep, they fit a new tank O-ring (78110) at the same time.\u003c\/p\u003e\u003ch3\u003eFits Across The ZX Range\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAstralpool ZX \/ Hurlcon ZX:\u003c\/strong\u003e ZX50, ZX75, ZX100, ZX150, ZX200, ZX250, ZX310\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZodiac ZXC:\u003c\/strong\u003e ZXC50 to ZXC310\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eZodiac ZCF \/ Titan ZCF:\u003c\/strong\u003e ZCF75 to ZCF200\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAstral SMART:\u003c\/strong\u003e SMART 350 \/ 450 \/ 550\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFiltrite CF \/ Aquatight:\u003c\/strong\u003e ZX-style cartridge filters\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eAlso Damaged The Lid Or Handles?\u003c\/h3\u003e\u003cp\u003eIf the lid, handles or air bleed are also cracked, the complete lid assembly is the better-value fix and includes a new ring: \u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/lid-for-astralpool-zx-smart-cartridge-filters\"\u003eZX \/ ZXC lid assembly with handles \u0026amp; locking ring — SP7820502\u003c\/a\u003e. Weeping only at the seal? You likely need just the \u003ca href=\"https:\/\/heaterandspaparts.com.au\/products\/o-ring-for-astralpool-hurlcon-zx-cartridge-filters\"\u003etank O-ring — 78110\u003c\/a\u003e.\u003c\/p\u003e\u003ch3\u003eWill Not Fit\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHurlcon QX\u003c\/strong\u003e — 222mm ring, a different filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAstralpool XC\u003c\/strong\u003e — a separate, unrelated filter series. \u003ca href=\"mailto:info@hasp.com.au\"\u003eContact us\u003c\/a\u003e with your model and a photo.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003ePart Numbers \u0026amp; Search References\u003c\/h3\u003e\u003cp\u003e7820002 · SP7820002 · Lock Ring ZX Filter · ZX locking ring · ZX lock nut · Zodiac ZXC lock ring · Hurlcon ZX filter ring · graphpearl ring · 290mm cartridge filter locking ring.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eDoes one ring fit all ZX filters?\u003c\/strong\u003e\u003cbr\u003eYes. The same locking ring, part 7820002, fits every ZX-family filter from the ZX50 to the ZX310.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMy filter is a Zodiac ZXC. Is this the right ring?\u003c\/strong\u003e\u003cbr\u003eYes. The Zodiac ZXC is the same filter as the Astralpool ZX, just Zodiac-badged, so this ring fits.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eMy filter is an Astralpool XC. Is this the right ring?\u003c\/strong\u003e\u003cbr\u003eNo. The XC is a separate, unrelated filter series and does not use the ZX ring. Contact us with your model and a photo and we will match the correct part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eThe ring is a different colour to mine. Will it still fit?\u003c\/strong\u003e\u003cbr\u003eYes. Colour has changed across production runs. The thread and fit are unchanged; current production is black.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould I buy the ring alone or the whole lid?\u003c\/strong\u003e\u003cbr\u003eIf only the ring is damaged, buy the ring. If the lid or handles are also cracked, the complete lid assembly is better value and includes a new ring.\u003c\/p\u003e\u003ch3\u003eManufacturer Catalogues, Diagrams \u0026amp; Part Numbers\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eNeed exploded views, spare part numbers, product numbers, diagrams, or more product information?\u003c\/strong\u003e See the manufacturer catalogues: \u003ca href=\"https:\/\/hasp.com.au\/pages\/Astralpool_Catalogue_2026\"\u003eAstralpool Catalogue 2026\u003c\/a\u003e | \u003ca href=\"https:\/\/hasp.com.au\/pages\/Zodiac_Catalogue_2026\"\u003eZodiac Catalogue 2026\u003c\/a\u003e\u003c\/p\u003e\u003cp\u003eAs with all products, these must be diagnosed and fitted by a qualified and experienced person. This is a \u003ca href=\"https:\/\/heaterandspaparts.com.au\/policies\/refund-policy\" rel=\"noopener\" target=\"_blank\"\u003especial-order\u003c\/a\u003e item.\u003c\/p\u003e\u003c!-- \/HASP-FLP-1.0 7820002 canary-end zx-lockring-echo --\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"FAQPage\",\"@id\":\"https:\/\/heaterandspaparts.com.au\/products\/lock-ring-zx-filter-graphpearl#faq\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Does one ring fit all ZX filters?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. The same locking ring, part 7820002, fits every ZX-family filter from the ZX50 to the ZX310.\"}},{\"@type\":\"Question\",\"name\":\"My filter is a Zodiac ZXC. Is this the right ring?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. The Zodiac ZXC is the same filter as the Astralpool ZX, just Zodiac-badged, so this ring fits.\"}},{\"@type\":\"Question\",\"name\":\"My filter is an Astralpool XC. Is this the right ring?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. The XC is a separate, unrelated filter series and does not use the ZX ring. Contact us with your model and a photo and we will match the correct part.\"}},{\"@type\":\"Question\",\"name\":\"The ring is a different colour to mine. Will it still fit?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. Colour has changed across production runs. The thread and fit are unchanged; current production is black.\"}},{\"@type\":\"Question\",\"name\":\"Should I buy the ring alone or the whole lid?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"If only the ring is damaged, buy the ring. If the lid or handles are also cracked, the complete lid assembly is better value and includes a new ring.\"}}]}]}\u003c\/script\u003e","brand":"FLUIDRA","offers":[{"title":"Default Title","offer_id":46836081918141,"sku":"7820002","price":133.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0372\/5253\/files\/astralpool-zodiac-lock-ring-zx-filter-graphpearl-7820002-911.webp?v=1780371994","url":"https:\/\/heaterandspaparts.com.au\/zh-hant\/products\/lock-ring-zx-filter-graphpearl","provider":"Heater and Spa Parts","version":"1.0","type":"link"}