Victor SR250D 540 Regulator (0781-0043) Victor Sale! from 28608 /per Qty. Add to Cart This item is a recurring or deferred purchase. By continuing, I agree to the cancellation policy and authorize you to charge my payment method at the prices, frequency and dates listed on this page until my order is fulfilled or I cancel, if permitted. This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. This regulator has a 540 valve connection for inert gases. SKU:VIC 0781-0043