Swivel adaptors to allow the connection of pressure gauges directly to the system with the dial positioned in the correct orientation. These adaptors have a built in "O" ring seal for pressure with sealing nipple to DIN 16288. The oil flow is restricted to the guage to dampen any pressure shocks (snubber effect).
Code 117803 has a 1/4" BSP parallel thread with 60 deg cone on the system end.