Malleable cast iron union (Taper seat / flat seat) is a detachable pipe fitting designed to create secure, leak-proof connections in a wide range of piping systems. Constructed from high-quality malleable iron, it consists of three components: a tail part, a head part, and a union nut, with female threads on both ends for installation. Ideal for plumbing, gas, water, and industrial pipelines, this union ensures easy installation, allows for quick disassembly during maintenance, and provides exceptional durability and long-term strength.
Available size (Source 1 with FM)
| Size | A (mm) | Type | Ref. No. |
|---|---|---|---|
| 1/4″ / DN8 / 13.5mm | 42 | Taper seat / flat seat | M3801 (FM) |
| 3/8″ / DN10 / 17.2mm | 45 | Taper seat / flat seat | M3802 (FM) |
| 1/2″ / DN15 / 21.3mm | 48 | Taper seat / flat seat | M3803 (FM) |
| 3/4″ / DN20 / 26.9mm | 52 | Taper seat / flat seat | M3804 (FM) |
| 1″ / DN25 / 33.7mm | 58 | Taper seat / flat seat | M3805 (FM) |
| 1-1/4″ / DN32 / 42.4mm | 65 | Taper seat / flat seat | M3806 (FM) |
| 1-1/2″ / DN40 / 48.3mm | 70 | Taper seat / flat seat | M3807 (FM) |
| 2″ / DN50 / 60.3mm | 78 | Taper seat / flat seat | M3808 (FM) |
| 2-1/2″ / DN65 / 76.1mm | 85 | Taper seat / flat seat | M3809 (FM) |
| 3″ / DN80 / 88.9mm | 95 | Taper seat / flat seat | M3810 (FM) |
| 4″ / DN100 / 114.3mm | 100 | Taper seat / flat seat | M3811 (FM) |
| 6″ / DN150 / 165.1mm | 144 | Taper seat / flat seat | M3813 (ISO) |
Note:
1. For taper (conical) seat, it is self-sealing without gasket. A brass ring is press-fitted to enhance the sealing performance.
2. For flat seat, it requires a separate gasket for sealing. TPMC could supply the rubber gasket as an optional accessory.
Available size (Source 2 with UL)
| Size | A (mm) | Type | Ref. No. |
|---|---|---|---|
| 1/4″ / DN8 / 13.5mm | 42 | Taper seat | M3821 (ISO) |
| 3/8″ / DN10 / 17.2mm | 45 | Taper seat | M3822 (ISO) |
| 1/2″ / DN15 / 21.3mm | 47 / 46 | Taper seat / flat seat | M3823 (UL) |
| 3/4″ / DN20 / 26.9mm | 52 / 50 | Taper seat / flat seat | M3824 (UL) |
| 1″ / DN25 / 33.7mm | 57 / 56 | Taper seat / flat seat | M3825 (UL) |
| 1-1/4″ / DN32 / 42.4mm | 65 / 63 | Taper seat / flat seat | M3826 (UL) |
| 1-1/2″ / DN40 / 48.3mm | 71 / 68 | Taper seat / flat seat | M3827 (UL) |
| 2″ / DN50 / 60.3mm | 79 / 76 | Taper seat / flat seat | M3828 (UL) |
| 2-1/2″ / DN65 / 76.1mm | 86 / 83 | Taper seat / flat seat | M3829 (UL) |
| 3″ / DN80 / 88.9mm | 95 / 93 | Taper seat / flat seat | M3830 (UL) |
| 4″ / DN100 / 114.3mm | 111 / 114 | Taper seat / flat seat | M3811 (FM) |
| 6″ / DN150 / 165.1mm | 144 | Taper seat / flat seat | M3831 (UL) |
Note:
1. For taper (conical) seat, it is self-sealing without gasket. A brass ring is press-fitted to enhance the sealing performance.
2. For flat seat, it requires a separate gasket for sealing. TPMC could supply the rubber gasket as an optional accessory.
3. This UL listed union is certified to NSF/ANSI/CAN 61 for use in drinking water systems.
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