4" brass plated (inside diameter) and laquered steel straight-edge check ring with 3/8" holethat slips standard 1/8 IPS pipe. (We also have 2 1/4", 2 1/2" ,3", 3 1/2", and we also have turned unfinished solid brass and rounded check rings.) We can combine with other items to save freight. $1.53 each.Shipping is $2.60 plus $.05 for each additional piece.Combined shipping- to get cheapest shipping costs (when buying different items)please buy what you need and “request invoice”so we can send invoice with lowershipping costs."How to Request Invoice when using shopping cart"---From your eCRATER cart, near the top of the page, move your mouse curser over our name “lamppartsguy” and a drop down menu will appear with the option to request invoice from seller.
