Flange (Loose Ring), Spigot PVC Schedule 80 3" (856-030FT)

The 856-030FT is a 3" Schedule 80 PVC Loose Ring Flange with a Spigot pipe-end connection — also known as a Van Stone style flange. This fitting consists of a spigot stub end and a separate loose backing ring that rotates freely around the pipe after installation. The spigot (male) end is sized to the OD of 3" PVC pipe, allowing it to insert directly into any standard 3" slip socket fitting, coupling, or valve body rather than receiving a pipe into a socket of its own — the defining characteristic that distinguishes the spigot flange from its slip socket counterpart. The loose backing ring slides over the spigot stub end before installation and is captured behind the flange face once the spigot is inserted into the receiving socket, providing the bolt clamping surface for the flanged connection.

The rotating ring is the core operational advantage of the Van Stone flange configuration over a solid style flange. Once the spigot end is seated in the receiving socket and the assembly is in place, the loose ring can be rotated to any angular position around the pipe axis — aligning the bolt holes to match any mating flange orientation without rotating the pipe, the fitting it is inserted into, or any cemented joint in the upstream assembly. This bolt hole alignment flexibility is particularly valuable in large or complex piping assemblies where achieving precise rotational alignment of a fixed-hole flange would require turning the entire upstream pipe run, and in retrofit or repair situations where an existing pipe assembly cannot be rotated to align a solid flange's fixed bolt pattern.

The spigot connection type distinguishes the 856-030FT from the slip socket loose ring flange (854-030FT) at the same size and schedule. Where the slip flange has a socket that receives a pipe end for cementing, the spigot flange inserts its own male end into a receiving socket upstream. This makes the 856-030FT the correct specification when the flange must connect to an existing 3" slip-socket fitting, coupling, or equipment port that already has an open socket — inserting the spigot into that socket and cementing the joint in place, rather than requiring an additional coupling or pipe stub to bridge from a slip flange socket to the existing fitting. The spigot configuration is the more compact option at any junction where a fitting socket is already present, as it eliminates one socket-to-socket connection from the assembly.

The flat face of the spigot stub end seats against the mating flange face with a gasket in between, and the loose ring provides the bolt clamping surface to complete the flanged connection at the ANSI Class 150 bolt pattern. A full-face or ring gasket should be used at the flange interface, and bolts should be torqued evenly in a cross pattern to manufacturer specifications — do not over-torque PVC flanges.

At 3", the 856-030FT is sized for mid-to-large diameter commercial and industrial piping — pump stations, chemical processing systems, water treatment plant piping, and municipal utility infrastructure where 3" PVC is a primary pipe size and flanged connections are required for bolted equipment interfaces and serviceable joints.

⚠️ Verify before ordering: The "FT" suffix in part number 856-030FT may denote a specific assembly configuration, material variant, or packaging (e.g., spigot stub end with backing ring included as a set). Confirm with your distributor or the manufacturer's current catalog whether the backing ring is included with this SKU or must be ordered separately before purchasing.

Specifications:

⚠️ Note: Pressure ratings decrease at elevated temperatures. Use a compatible full-face gasket and torque bolts evenly in a cross pattern to manufacturer specifications. Never over-torque PVC flanges — the stub end face is the sealing surface and is susceptible to cracking under uneven bolt load. The spigot end must be fully seated to socket depth in the receiving fitting before cementing — do not partially seat and cement. Consult manufacturer derating tables for elevated-temperature service.

Industries & Applications:

• Water & Wastewater Treatment — Connects 3" Schedule 80 PVC pipe assemblies to flanged pump inlets and outlets, filter housings, and treatment equipment where an existing socket fitting is present upstream of the flange point and the spigot end provides the most compact connection without an additional joining fitting; the rotating ring eliminates bolt hole alignment complications on treatment plant equipment pads where assembled pipe spools cannot be rotated
• Chemical Processing — Provides a compact flanged termination on 3" chemical distribution and process lines where the spigot inserts into an existing tee, coupling, or valve socket upstream, minimizing the fitting count at the flange connection point and delivering the bolt hole alignment flexibility of the Van Stone design without requiring pipe rotation in corrosive-service assemblies
• Industrial Process Piping — Used on process skid assemblies and modular pipe spools where a 3" flanged connection must be made to existing socket fittings with the most compact possible spigot-to-flange transition, and where pre-fabricated pipe spools must bolt to equipment without the ability to rotate the spool for bolt hole alignment
• Pump Station & Equipment Connections — Installed at pump discharge and suction connections where the upstream pipe assembly includes an open socket fitting that receives the spigot end directly, eliminating a coupling or stub pipe between the existing fitting and the flange body while retaining full Van Stone bolt alignment flexibility at the equipment interface
• Municipal & Utility Infrastructure — Applied on 3" municipal water distribution and pump station assemblies where flanged connections to valves, meters, and equipment must be made to existing socket fittings in valve vaults and confined spaces where bolt hole alignment without pipe rotation is essential for practical installation
• Irrigation & Agricultural Systems — Connects 3" cemented PVC supply assemblies to flanged pump equipment, large valve bodies, and metering devices on high-volume irrigation systems where the spigot insertion into an existing fitting socket provides a compact, low-fitting-count flange connection with full rotational bolt alignment capability