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This is part is customized end cap in 8", the npt male also can be female in 1/2", 3/8" or 3/4" etc, extended through the end cap in any length or not, big view sight glass can take 150psi pressure, 2" or other size clamp ferrule in the center or on the side is optional. Customized is available. 6",10",12" are available.
All parts are placed as close to the edge of the lid without obstructing the clamp. This gives you more clearance to work with.
We are looking retailer of this serious products, feel free to contact me.