What is the minimum pressure for transfill to a receiver on a 4500 psi SCBA?

The minimum pressure for transfill to a receiver on a 4500 psi SCBA is correctly identified as 2000 psi. In a transfill procedure, it is crucial that there is a sufficient pressure differential between the source cylinder (the SCBA with gas) and the receiver cylinder (the one being filled). For safe and efficient transfill operations, tanks must generally have a pressure of at least 2000 psi. This ensures that the gas will flow from the higher pressure source into the lower pressure receiver, allowing for a successful transfer of air. If the cylinder pressure were significantly lower, it could hinder the transfill process by not providing enough pressure to push the air into another cylinder. Therefore, 2000 psi is considered the minimum threshold to facilitate a proper transfill from a 4500 psi SCBA to a receiver.