This manway gasket seals the joint between a SteelFront round manway flange and its bolted cover. It is 1/8″ Fibreflex sheet, cut to the manway diameter and double punched. One gasket fits either bolt pattern, so you only need to know the diameter.
Sizes and prices
| Manway diameter | SKU | Price | Weight (lb) |
|---|---|---|---|
| 16″ | INV-101088 | $30.25 | 0.40 |
| 18″ | INV-101087 | $33.40 | 0.55 |
| 20″ | INV-101086 | $44.28 | 0.60 |
| 24″ | INV-101085 | $56.82 | 0.65 |
| 30″ | INV-101089 | $86.93 | 1.20 |
| 36″ | INV-101090 | $98.21 | 1.35 |
Manway gasket sizes: what each one fits
| Manway diameter | Fits flange / cover OD | Bolt circle | Bolt holes | Thickness |
|---|---|---|---|---|
| 16″ | 20-1/2″ | 19″ | 9/16″ | 1/8″ |
| 18″ | 22-1/2″ | 21″ | 9/16″ | 1/8″ |
| 20″ | 24-1/2″ | 23″ | 9/16″ | 1/8″ |
| 24″ | 28-1/2″ | 27″ | 9/16″ | 1/8″ |
| 30″ | 35″ | 33″ | 9/16″ | 1/8″ |
| 36″ | 41″ | 39″ | 9/16″ | 1/8″ |
Measuring a manway from another maker? Follow the steps in our manway gasket sizes guide before you order.
Fitting tips
- Order by manway diameter (16″, 18″, 20″, 24″, 30″ or 36″).
- Clean both flange faces, center the gasket on the bolts, then tighten the cover bolts gradually in a star pattern.
- Replace the gasket every time the cover is removed for inspection or cleaning. A crushed gasket rarely seals a second time.
- Keep spares on hand for tank inspections and turnarounds.
Questions
Will this fit a non-SteelFront manway?
Only if the inside diameter, outside diameter and bolt holes match. Measure your flange before ordering.
What seals a rectangular cleanout?
The 2″ neoprene gasket roll is used on the rectangular cleanout frame.
Which manway gasket size do I order?
Order the gasket with the same nominal diameter as your manway: 16″, 18″, 20″, 24″, 30″ or 36″. Because it is double punched, the bolt pattern doesn’t matter.
See all tank manway parts.
Ordering and shipping
Every option above has a posted price, so you can order one part or a full set for a tank build without asking for a quote. Parts ship from Hutchinson, Kansas to addresses in the United States, and anything over 70 lb ships by freight. You can also choose free local pickup at our Hutchinson plant at checkout. Questions about fit or quantity? Call (800) 258-1392, Monday to Friday, 8am to 4pm CST.
