Click to expand Tap to zoom Portable cabinet - extension – M647-584-002 Quantity 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. Extension to be used with the M647-587-001 and M647-584-002 portable cabinet for cylinder test.