The Singularity Computers Protium reservoir 250mm is a transparent acrylic expansion tank with a diameter of 60mm and a height of 289mm when combined with the acrylic attachments. It has a total of seven G1/4" ports and comes with a 90° quad port cap, a triple port cap, a 16mm internal acrylic flow standpipe, 5 G1/4" stop fittings, and 2 silicone O-rings. The tank is made of acrylic, while the retention rings are made of aluminum, and it has a sleek silver and transparent design.