prices on 21 model
Metal
— strong, durable, reliable, but at the same time quite expensive and heavy material, which also requires special measures to prevent corrosion (which also affects the cost). Thus, an all-metal housing is rare and most often a sign of a powerful advanced sprinkler; most of these models are impulse (see "Type"). However, combined metal-plastic models are also produced, which are also included in this category. They favorably differ from all-metal ones by their lower price and weight, and from plastic ones by their high strength.