Otto Maierhofer GmbH
About
Otto Maierhofer GmbH, a fourth-generation family-owned company based in Neubeuern near Rosenheim, Germany, is a specialized manufacturer of sealing inserts (Dichtungseinsätze) and annular gap seals (Ringraumdichtungen) for pipe and cable penetrations through walls, ceilings, and floor slabs. All products use EPDM 45 Shore rubber plates sandwiched between V2A stainless steel plates with V4A stainless steel fasteners, and are certified for pressurized water tightness to 5 bar with IRO and MFPA test certificates. The standard Dichteinsatz 60 mm series covers DN 60 through DN 700 for pressurized water applications, while the 30 mm series addresses non-pressurized requirements. Specialized variants include Soft (for sensitive pipe materials), exzentrisch (for off-center pipe positions), geteilt/split (for retro-sealing existing penetrations without disassembly), and FW 90 mm (for wider sealing contact). The Mehrfach Durchführung accommodates up to 15 cables or small pipes through a single core bore (DN 45–DN 200) in closed or split versions. Additional products encompass Blinddichteinsatz (temporary blanking of unused penetrations), Wasserhauseinführung (double-sealing water service entry into buildings), Mauerkragen wall collars with lightning protection variant, Dichteinsatz for KG sewer and Steinzeug vitrified clay pipes, Spülbox flushing access points, sight glasses for biogas plants, and stainless steel fitting and removal pieces for plant engineering. Over 800 variants are stocked for same-day shipment.
Key Products
Standard sealing insert with 60 mm seal width for pressurized water (up to 5 bar), available from DN 60 to DN 700, for core-drilled holes or sleeve pipes.
Sealing insert with 30 mm seal width for non-pressurized water penetration sealing applications.
Flexible sealing insert for sensitive or fragile pipe materials, available in 60 mm seal width.
Split sealing insert available in 60 mm and 30 mm widths for retro-sealing existing pipe penetrations without disassembly.
Eccentric sealing insert for offset pipe positions where the pipe is not centered in the penetration.
Sealing insert with 90 mm seal width for applications requiring wider sealing contact.
Sealing system for up to 15 cables or small pipes through a single core bore (DN 45 to DN 200), available in closed or split versions.
Blind sealing insert for temporarily sealing unused wall or floor penetrations, available with large flange option.
Double-sealing penetration system specifically designed for water service line entries into buildings.
Annular gap seal specifically designed for KG (sewer) pipe penetrations through walls and floors.
Sealing insert specifically designed for vitrified clay pipe penetrations.
Wall collar for sealing pipe penetrations through masonry, available with lightning protection variant.
Sleeve pipes for creating the penetration opening through walls and floors before seal installation.
Flushing box for accessing and flushing pipe penetration points in building services.
Sight glass specifically designed for biogas plant applications to allow visual inspection of process media.
Fitting and removal pieces in stainless steel for custom piping configurations in plant engineering.
Custom-fabricated stainless steel pipe fittings in Type 1 (short) and Type 2 (long) installation lengths.
Core bore sealing and coating system for ensuring watertight pipe penetration installations.
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