{"id":8819,"date":"2026-02-17T12:44:39","date_gmt":"2026-02-17T12:44:39","guid":{"rendered":"https:\/\/www.poolparthub.com\/?post_type=product&#038;p=8819"},"modified":"2026-03-24T10:10:16","modified_gmt":"2026-03-24T10:10:16","slug":"astralpool-c71-mechanical-flange-1-2-3-4-1-1-25-hp-4405010424","status":"publish","type":"product","link":"https:\/\/www.poolparthub.com\/nl\/product\/astralpool-c71-mechanical-flange-1-2-3-4-1-1-25-hp-4405010424\/","title":{"rendered":"Astralpool C71 mechanical flange 1\/2\u20133\/4\u20131\u20131.25 HP &#8211; 4405010424"},"content":{"rendered":"<h2>Astralpool C71 mechanical flange 1\/2\u20133\/4\u20131\u20131.25 HP 4405010424<\/h2>\n<p>\nThe Astralpool C71 mechanical flange 1\/2\u20133\/4\u20131\u20131.25 HP 4405010424 is the original interface piece between the motor and the hydraulic<br \/>\nbody on selected Astralpool pool pumps. It centres the motor, supports the mechanical seal and keeps the impeller at the correct distance<br \/>\nfrom the diffuser, which is essential for smooth, efficient filtration in residential pools.\n<\/p>\n<h3>Main features of the Astralpool C71 mechanical flange<\/h3>\n<ul>\n<li>Original Astralpool flange for C71 frame motors from 0.5 to 1.25 HP.<\/li>\n<li>Houses the stationary part of the mechanical seal and shaft passage.<\/li>\n<li>Machined surfaces for accurate motor and pump body alignment.<\/li>\n<li>Fixing points matched to compatible Astralpool pump housings.<\/li>\n<\/ul>\n<h3>Function in the pump assembly<\/h3>\n<p>\nThe mechanical flange is a structural link between the electric motor and the pump body. The Astralpool C71 mechanical flange<br \/>\n1\/2\u20133\/4\u20131\u20131.25 HP 4405010424 positions the motor shaft in line with the impeller and maintains the precise spacing needed for the impeller<br \/>\nand diffuser to work together correctly. It also provides the recess for the stationary seal seat, forming a key element of the shaft<br \/>\nsealing system.\n<\/p>\n<ul>\n<li>Aligns the motor shaft with the impeller for efficient power transfer.<\/li>\n<li>Supports and centres the mechanical seal to prevent water ingress to the motor.<\/li>\n<li>Provides a rigid connection that helps limit vibration and operating noise.<\/li>\n<\/ul>\n<h3>Compatibility and typical applications<\/h3>\n<p>\nThis mechanical flange is designed for Astralpool circulation pumps that use a C71 frame motor in the 0.5, 0.75, 1 or 1.25 HP range and<br \/>\nthat specify reference 4405010424 in their exploded view or spare parts list. It is commonly used in residential filtration systems with<br \/>\nsand, glass or cartridge filters where the pump runs many hours per day.\n<\/p>\n<ul>\n<li>Suitable for Astralpool pumps with C71 frame motors from 0.5 to 1.25 HP.<\/li>\n<li>Recommended when replacing the motor or rebuilding the hydraulic section.<\/li>\n<li>Direct replacement for worn or damaged flanges that no longer align correctly.<\/li>\n<\/ul>\n<h3>When to replace the mechanical flange 4405010424<\/h3>\n<p>\nAlthough the flange is not in constant contact with pool water, it is subjected to mechanical loads, occasional moisture and handling<br \/>\nduring maintenance. Damage or deformation can compromise alignment and reduce the life of the mechanical seal and bearings.\n<\/p>\n<ul>\n<li>Cracks, broken ears or visible deformation of the flange body.<\/li>\n<li>Corrosion or wear around the mechanical seal seat or shaft opening.<\/li>\n<li>Thread damage in the fixing holes that prevents safe tightening.<\/li>\n<li>Repeated seal failures or unusual vibration after other causes have been excluded.<\/li>\n<\/ul>\n<p>\nReplacing a compromised flange with the original Astralpool C71 mechanical flange 1\/2\u20133\/4\u20131\u20131.25 HP 4405010424 helps restore correct<br \/>\nalignment and stable, quiet pump operation.\n<\/p>\n<h3>Installation recommendations<\/h3>\n<p>\nInstallation of the Astralpool C71 mechanical flange 4405010424 is normally done during a major pump service or motor change. The system<br \/>\nmust always be isolated electrically and hydraulically before work begins.\n<\/p>\n<ul>\n<li>Switch off the power supply, close isolation valves and drain the pump housing.<\/li>\n<li>Separate the wet end from the motor and remove the existing flange and mechanical seal.<\/li>\n<li>Clean the contact faces on the motor and pump body to remove rust and deposits.<\/li>\n<li>Press the new mechanical seal seat into the flange, following the correct orientation.<\/li>\n<li>Bolt the flange to the motor, then to the pump body, tightening screws evenly in a cross pattern.<\/li>\n<li>Refit the impeller and remaining parts, checking that the shaft turns freely by hand before priming.<\/li>\n<\/ul>\n<p>\nAfter reassembly, prime the pump, start filtration and monitor the seal area and general noise level to confirm that alignment and<br \/>\nsealing are correct.\n<\/p>\n<h3>Good practice for long term reliability<\/h3>\n<p>\nWith the Astralpool C71 mechanical flange 1\/2\u20133\/4\u20131\u20131.25 HP 4405010424 correctly installed, a few simple habits help extend the life of<br \/>\nthe flange, seal and motor.\n<\/p>\n<ul>\n<li>Mount the pump on a solid, level base with properly supported pipework.<\/li>\n<li>Avoid overtightening fixing screws to prevent stress in the flange body.<\/li>\n<li>Replace the mechanical seal whenever the flange or motor is renewed.<\/li>\n<li>Inspect the flange area during annual maintenance for early signs of corrosion or distortion.<\/li>\n<\/ul>\n<p>\nUsing the original Astralpool C71 mechanical flange 4405010424 helps compatible pumps maintain precise motor alignment, reliable shaft<br \/>\nsealing and quiet, efficient filtration over many swimming seasons.<\/p>","protected":false},"excerpt":{"rendered":"<p>Astralpool C71 mechanical flange 1\/2\u20133\/4\u20131\u20131.25 HP 4405010424 The Astralpool C71 mechanical flange 1\/2\u20133\/4\u20131\u20131.25 HP 4405010424 is the original interface piece between the motor and the hydraulic body on selected Astralpool pool pumps. It centres the motor, supports the mechanical seal and keeps the impeller at the correct distance from the diffuser, which is essential for<a href=\"https:\/\/www.poolparthub.com\/nl\/product\/astralpool-c71-mechanical-flange-1-2-3-4-1-1-25-hp-4405010424\/\">Continue reading <span class=\"sr-only\">&#8220;Astralpool C71 mechanical flange 1\/2\u20133\/4\u20131\u20131.25 HP &#8211; 4405010424&#8221;<\/span><\/a><\/p>","protected":false},"featured_media":8821,"comment_status":"open","ping_status":"closed","template":"","meta":{"_acf_changed":false,"bwfblock_default_font":"","inline_featured_image":false},"product_brand":[920],"product_cat":[1721],"product_tag":[],"class_list":["post-8819","product","type-product","status-publish","has-post-thumbnail","product_brand-astralpool","product_cat-spare-parts","first","onbackorder","taxable","shipping-taxable","purchasable","product-type-simple"],"acf":{"pph_product_template":"spare_part","pph_extra_parts_check":"","pph_spare_parts":null,"pph_extra_spare_parts":null,"extra_product_tabs":null,"main_product_link":null,"restock_info":"","exploded_view_link":"","details_product":[{"text_details_type":"yes","text_details_product":"Original C71 flange matched to 0.5\u20131.25 HP Astralpool pumps. "},{"text_details_type":"yes","text_details_product":"Restores precise motor and impeller alignment for proper performance. "},{"text_details_type":"yes","text_details_product":"Integrates the mechanical seal seat for reliable shaft sealing. "},{"text_details_type":"yes","text_details_product":"Ideal to install together with a new motor and seal during overhaul."},{"text_details_type":"no","text_details_product":"Only compatible with pumps that specify reference 4405010424. "},{"text_details_type":"no","text_details_product":"Replacement requires partial disassembly of motor and wet end."}],"details_product_exploded":null,"pph_card_badge_use_custom":false,"pph_card_badge_text":"","pph_card_badge_background_color":"#ADC2F7","pph_card_badge_border_color":"#ADC2F7","pph_card_badge_text_color":"#2B46AB"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.4 (Yoast SEO v27.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Astralpool C71 mechanical flange 1\/2\u20133\/4\u20131\u20131.25 HP - 4405010424 | PoolPartHub<\/title>\n<meta name=\"description\" content=\"Astralpool C71 mechanical flange 4405010424 for 0.5\u20131.25 HP pumps, restoring correct motor alignment, seal seating and quiet, reliable pool filtration.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.poolparthub.com\/nl\/product\/astralpool-c71-mechanical-flange-1-2-3-4-1-1-25-hp-4405010424\/\" \/>\n<meta property=\"og:locale\" content=\"nl_NL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Astralpool C71 mechanical flange 1\/2\u20133\/4\u20131\u20131.25 HP - 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