SC Protium 2.0 Stop Plug SC-STOP-PLUG The Singularity Computers Stop Plug is for use on Protium 1.0 and 2.0 D5 Reservoir Combos and D5 Pump Tops. This is a hidden Stop Plug which has nothing protruding outside of the port. The purpose of the Stop Plug is so that our Universal Backplate can be mounted on three sides of the Protium 1.0 or 2.0 Pump Top, and so that Protium 2.0 Pump Tops can be mounted from the bottom, without the stop fittings being in the way. Specifications: Stop Plug: Brass G1/4” BSPP. O-ring: 8mm Nitrile. Weight: 0.004kg. Dimensions: Diameter: 13mm. Height: 8mm. Packaged Weight: 0.005kg. Packaged Dimensions: 100mm x 200mm x 10mm.