{"id":1337,"date":"2025-06-17T04:59:01","date_gmt":"2025-06-17T04:59:01","guid":{"rendered":"https:\/\/tqwater.co.za\/?product=889simpletqvacc-rp-4-gadaptor-4-inch-2"},"modified":"2026-02-25T20:44:27","modified_gmt":"2026-02-25T20:44:27","slug":"889simpletqvacc-rp-4-gadaptor-4-inch-2","status":"publish","type":"product","link":"https:\/\/tqwater.co.za\/?product=889simpletqvacc-rp-4-gadaptor-4-inch-2","title":{"rendered":"Reducer Plug 4inch to 2\u00bd"},"content":{"rendered":"

Adapter<\/strong> is a precision-molded reducer that converts a 4-inch threaded opening<\/strong> on an FRP (Fiberglass Reinforced Plastic) pressure vessel to a 2.5-inch threaded port<\/strong>. It provides a secure, leak-free connection for standard 2.5″ filtration control valves, making it ideal for water softeners, filtration tanks, and reverse osmosis systems.<\/p>\n

This adapter is perfect for new installations<\/strong> or retrofitting existing FRP tanks<\/strong>, allowing larger vessels to accommodate smaller, standard control valves without compromising performance.<\/p>\n

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Key Features<\/strong><\/h2>\n
    \n
  • \n

    Converts 4″ FRP vessel threads to 2.5″<\/p>\n<\/li>\n

  • \n

    Enables installation of 2.5″ control valves on larger vessels<\/p>\n<\/li>\n

  • \n

    Durable, corrosion-resistant engineering plastic<\/p>\n<\/li>\n

  • \n

    Quick and easy installation with standard threading<\/p>\n<\/li>\n

  • \n

    Ideal for both new setups and retrofits<\/p>\n<\/li>\n

  • \n\n\n\n
    \n

    Typical 4\u2033 \u2192 2.5\u2033 Adaptor Sizes (in mm)<\/strong><\/h1>\n

    \ud83d\udd35 4\u2033 Side (Outer Thread)<\/strong><\/h3>\n
      \n
    • \n

      Major diameter: 113\u2013116 mm<\/strong><\/p>\n<\/li>\n

    • \n

      Thread type: BSPP or BSPT<\/strong> (depending on supplier)<\/p>\n<\/li>\n<\/ul>\n

      \ud83d\udd35 2.5\u2033 Side (Inner Thread)<\/strong><\/h3>\n
        \n
      • \n

        Major diameter: 75\u201378 mm<\/strong><\/p>\n<\/li>\n

      • \n

        Thread type: BSPP<\/strong> usually<\/p>\n<\/li>\n

      • \n

        Depth: 18\u201325 mm<\/strong><\/p>\n<\/li>\n<\/ul>\n

        \ud83d\udd35 Height<\/strong><\/h3>\n
          \n
        • \n

          35\u201350 mm<\/p>\n<\/li>\n<\/ul>\n

          \ud83d\udd35 Material<\/strong><\/h3>\n
            \n
          • \n

            PP (Polypropylene)<\/p>\n<\/li>\n

          • \n

            ABS<\/p>\n<\/li>\n

          • \n

            Nylon (strongest)<\/p>\n<\/li>\n<\/ul>\n

            \ud83d\udd35 O-ring<\/strong><\/h3>\n

            Most 4″ adaptors use:<\/p>\n

              \n
            • \n

              90\u201395 mm ID O-ring<\/strong><\/p>\n<\/li>\n

            • \n

              5\u20137 mm cross-section<\/strong><\/p>\n<\/li>\n<\/ul>\n

              -ADPT-4-2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/li>\n<\/ul>\n

              \n

              Applications<\/strong><\/h2>\n
                \n
              • \n

                Water softeners<\/p>\n<\/li>\n

              • \n

                Sand, carbon, or multimedia filtration systems<\/p>\n<\/li>\n

              • \n

                Reverse osmosis (RO) units<\/p>\n<\/li>\n

              • \n

                Domestic and commercial FRP filter vessels<\/p>\n<\/li>\n<\/ul>\n

                \n

                Technical Specifications<\/strong><\/h2>\n
                \n
                \n\n\n\n\n\n\n\n\n\n\n\n\n\n
                Parameter<\/strong><\/th>\nSpecification<\/strong><\/th>\n<\/tr>\n<\/thead>\n
                Model \/ Part<\/strong><\/td>\nADAP-4-2.5<\/td>\n<\/tr>\n
                Function<\/strong><\/td>\nThreaded reducer: 4″ FRP vessel \u2192 2.5″ port<\/td>\n<\/tr>\n
                Material<\/strong><\/td>\nHigh-strength, corrosion-resistant engineering plastic (PP\/ABS)<\/td>\n<\/tr>\n
                Compatible Vessel Size<\/strong><\/td>\n4″ FRP top-opening vessels<\/td>\n<\/tr>\n
                Compatible Valve Size<\/strong><\/td>\n2.5″ threaded filtration\/control valves<\/td>\n<\/tr>\n
                Thread Type<\/strong><\/td>\nStandard FRP-compatible threads<\/td>\n<\/tr>\n
                Installation<\/strong><\/td>\nTop of FRP vessels, screw-on setup<\/td>\n<\/tr>\n
                Applications<\/strong><\/td>\nWater softeners, filtration tanks, RO systems<\/td>\n<\/tr>\n
                Maintenance<\/strong><\/td>\nEasy to inspect and replace if necessary<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

                Adapter is a precision-molded reducer that converts a 4-inch threaded opening on an FRP (Fiberglass Reinforced Plastic) pressure vessel to a 2.5-inch threaded port. It provides a secure, leak-free connection for standard 2.5″ filtration control valves, making it ideal for water softeners, filtration tanks, and reverse osmosis systems. This adapter is perfect for new installations […]<\/p>\n","protected":false},"featured_media":2471,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[298,300],"product_tag":[],"class_list":["post-1337","product","type-product","status-publish","has-post-thumbnail","product_cat-frp-fiberglass-pressure-vessels-fittings-and-parts","product_cat-vessel-accessories","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/tqwater.co.za\/index.php?rest_route=\/wp\/v2\/product\/1337","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tqwater.co.za\/index.php?rest_route=\/wp\/v2\/product"}],"about":[{"href":"https:\/\/tqwater.co.za\/index.php?rest_route=\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/tqwater.co.za\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1337"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tqwater.co.za\/index.php?rest_route=\/wp\/v2\/media\/2471"}],"wp:attachment":[{"href":"https:\/\/tqwater.co.za\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1337"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/tqwater.co.za\/index.php?rest_route=%2Fwp%2Fv2%2Fproduct_brand&post=1337"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/tqwater.co.za\/index.php?rest_route=%2Fwp%2Fv2%2Fproduct_cat&post=1337"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/tqwater.co.za\/index.php?rest_route=%2Fwp%2Fv2%2Fproduct_tag&post=1337"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}