The item available here is a new old stock Parker relief valve.  It comes as shown with no original packaging and only light shelf wear.

This item has not been tested, and comes with a 30 day return policy from the date the item was shipped. Postage is not covered.

Here's the specs:

Part No: 636B-3-1/2-2

*See pictures for exactly what you will receive*

Items will be paid for immediately and will be shipped using UPS or USPS.