function epdc_custom_document_title($title){
 if(is_page('about-us')) return 'About Us | Dacromet Coated Roller Chain Manufacturer & Supplier';
 if(is_page('contact-us')) return 'Contact Us | Dacromet Roller Chain Quote & Technical Inquiry';
 $titles=[
  'agricultural-machinery'=>'Corrosion Resistant Roller Chains for Agricultural Machinery | EVER-POWER',
  'food-beverage-industry'=>'Corrosion Resistant Roller Chains for Food Processing | EVER-POWER',
  'car-wash-equipment'=>'Corrosion Resistant Chains for Car Wash Conveyors | EVER-POWER',
  'marine-offshore'=>'Marine Corrosion Resistant Roller Chains | EVER-POWER',
  'wastewater-treatment'=>'Corrosion Resistant Chains for Wastewater Treatment | EVER-POWER',
  'outdoor-conveyor-systems'=>'Rust Resistant Roller Chains for Outdoor Conveyors | EVER-POWER',
 ];
 foreach($titles as $slug=>$custom) if(is_page($slug)) return $custom;
 return $title;
}
add_filter('pre_get_document_title','epdc_custom_document_title',20);
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