Replace out HEX characters in WordPress attachment URL

functions.php

add_filter( 'wp_get_attachment_url', 'lunarwp_modify_attachment_url', 10, 2 );
/**
 * Replace out hex characters in an URL
 *
 * @since  1.0.0
 * 
 * @param  string 	$url     	Attachment URL
 * @param  integer 	$post_ID  	Optional. Attachment ID. Default 0.
 * @return string          		Returns the amended attachment url
 */
function lunarwp_modify_attachment_url( $url, $post_ID )
{
	//* the 1st parameter is for the hex to be replaced
	//* the 2nd parameter is what to replace it with when found
	//* The 3rd parameter is the string to evaluated
	$url = str_replace( '%2B', '+', $url );

	return $url;
}