GROCO Sight Glass f/ARG-2500 Series. Sight Glass is a key feature that helps locate and acquire your target faster and more efficiently. This Groco Sight Glass f/ARG-2500 Series features a clear body that allows you to see target/background clearly at all times. We are proud to offer a large range of Groco Pump Parts Pump Accessories Pump Grip & Case Lubricants & Maintenance and other great products. For more great products and tools from GROCO please visit our Groco page. For more sights sight glasses refractometers and other products please visit our Groco Pump Parts Pump Accessories and Pump Sleeves store section. Specifications for GROCO ARG-2503 Sight Glass f/ARG-2500 Series: Manufacturer: GROCO Color: Black Features of GROCO ARG-2503 Sight Glass f/ARG-2500 Series Sight Glass Clear Specifically for ARG-2500 Series Package Contents: GROCO ARG-2503 Sight Glass f/ARG-2500 Series GROCO ARG-2503: Sight Glass f/ARG-2500 Series ARG-2503