Specific pumps to spray medium and large crop areas applicable to both towed and mounted sprinklers and sprayers. The external manifolds of the pumps manufactured by Catterin Pompe snc can be easily inspected. They are long-lasting and reliable, guaranteed by mechanisms in oil baths and maximum rust resistance. This is ensured by the use of brass and stainless steel for those parts in contact with the liquid. The system features a semi automatic regulation valve.