Существуют ли какие ограничения по повторному (перемонтаж) использованию пресс фитингов? Например, если соединение простояло 3-4 месяца.

Все очень просто. Срезается труба и гильза, заменяется уплотнительная резинка и гильза, монтируется новая труба и все прессуется.

Резинки (колечки) продаются отдельно?

Да, резинки менять обязательно, лучше повторно не использовать - могут потечь после опрессовки.

Я не могу их найти, а если отсутствуют оригинальные, что порекомендуете для замены? Это обычная резинка?

Рекомендую заменить фитинг в сборе.

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