Shower Door Seal for 3/8 Inch Glass
Quick answer
3/8 inch (9.5 mm) is the standard thickness for frameless hinged shower doors in the US, so it has the widest choice of replacement seals: press-on bottom sweeps with or without a drip rail, side seals, magnetic pairs, and h-jamb strips. Confirm the thickness anyway before ordering — heavy doors are often 1/2 inch, and a 3/8 inch channel will not seat on them.
3/8″ glass = 3/8″ · 0.375 in · 9.5 mm
Data reviewed:
Which doors use 3/8″ glass
Frameless hinged doors (the classic glass-and-hinges look), most frameless inline door-plus-panel setups, and many high-end sliding systems.
What to measure before buying
- Glass thickness at the bare edge — pull back a section of the old seal first (1/4″, 5/16″, 3/8″, or 1/2″)
- Bottom gap from glass edge to threshold at the HINGE end, door closed
- Bottom gap at the HANDLE end, door closed — note any difference
- Door width along the bottom edge (for trimming the new seal)
- Where the water actually exits: under the door, off a bottom corner, or down a vertical edge
- Photo of the old seal's cross-section before removing it
- Bottom gap at BOTH the hinge and handle ends (sagging doors read different gaps)
- Whether the old sweep has an angled drip rail fin on the outside face
Seal-type compatibility with 3/8″ glass
| Seal type | Fits 3/8″? | Catalog glass range | Note |
|---|---|---|---|
| Bottom sweep | Yes | 5/16–3/8″ | In our reviewed catalog |
| Drip rail | Yes | 3/8″ | In our reviewed catalog |
| Side seal | Yes | 3/8″ | In our reviewed catalog |
| Magnetic seal | Yes | 3/8″ | In our reviewed catalog |
| Bulb seal | Yes | 3/8″ | In our reviewed catalog |
| H-jamb seal | Yes | 3/8″ | In our reviewed catalog |
| U-channel seal | Yes | 3/8″ | In our reviewed catalog |
Best seal types for 3/8″ glass
Replacement seals for 3/8″ glass
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Frameless Shower Door Bottom Sweep with Drip Rail, 3/8 in Glass, 1/2 in Wipe, 32 in
- Glass
- 3/8″
- Gap
- 1/8–3/8″
- Length
- 32″
- Material
- Polycarbonate channel, PVC wipe
- Mount
- press-on
- Trim
- Cut to size
Channel is sized to the glass — verify thickness with a caliper. The 1/2 in wipe seals gaps of 1/8 in–3/8 in. Cut with a fine-tooth hacksaw.
Frameless Shower Door Bottom Sweep with Drip Rail, 3/8 in Glass, 1/2 in Wipe, 36 in
- Glass
- 3/8″
- Gap
- 1/8–3/8″
- Length
- 36″
- Material
- Polycarbonate channel, PVC wipe
- Mount
- press-on
- Trim
- Cut to size
Channel is sized to the glass — verify thickness with a caliper. The 1/2 in wipe seals gaps of 1/8 in–3/8 in. Cut with a fine-tooth hacksaw.
Frameless Shower Door Bottom Sweep with Drip Rail, 3/8 in Glass, 1/2 in Wipe, 48 in
- Glass
- 3/8″
- Gap
- 1/8–3/8″
- Length
- 48″
- Material
- Polycarbonate channel, PVC wipe
- Mount
- press-on
- Trim
- Cut to size
Channel is sized to the glass — verify thickness with a caliper. The 1/2 in wipe seals gaps of 1/8 in–3/8 in. Cut with a fine-tooth hacksaw.
Frameless Shower Door Bottom Sweep with Drip Rail, 3/8 in Glass, 3/4 in Wipe, 36 in
- Glass
- 3/8″
- Gap
- 3/8–5/8″
- Length
- 36″
- Material
- Polycarbonate channel, PVC wipe
- Mount
- press-on
- Trim
- Cut to size
Channel is sized to the glass — verify thickness with a caliper. The 3/4 in wipe seals gaps of 3/8 in–5/8 in. Cut with a fine-tooth hacksaw.
Frameless Shower Door Bottom Sweep with Drip Rail, 3/8 in Glass, 3/4 in Wipe, 48 in
- Glass
- 3/8″
- Gap
- 3/8–5/8″
- Length
- 48″
- Material
- Polycarbonate channel, PVC wipe
- Mount
- press-on
- Trim
- Cut to size
Channel is sized to the glass — verify thickness with a caliper. The 3/4 in wipe seals gaps of 3/8 in–5/8 in. Cut with a fine-tooth hacksaw.
Shower Door Bottom Sweep (Wipe Only), 3/8 in Glass, 1/2 in Wipe, 36 in
- Glass
- 3/8″
- Gap
- 1/8–3/8″
- Length
- 36″
- Material
- Clear PVC
- Mount
- press-on
- Trim
- Cut to size
No drip rail on the outer face — choose this when water passes under the door but the bottom corners stay dry. Generous length for trimming to width.
Common buying mistakes
- Measuring thickness with the old seal still on the glass — pull a section off first.
- Guessing between 3/8″ and 1/2″ by eye; the 1/8″ difference is nearly invisible but decides the fit.
- Cutting the new sweep to length before test-fitting the channel on a corner of the door.
Frequently asked questions
Is 10 mm glass the same as 3/8 inch?
Close but not identical: 3/8 inch is 9.5 mm. Most flexible 3/8 inch seals list a 9.5–10 mm range and fit both; rigid channels may be 9.5 mm only, so check the listing if your door is imported 10 mm glass.
What is the most common frameless shower door glass thickness?
3/8 inch (9.5 mm) is the US standard for frameless hinged doors. 1/2 inch appears on heavier premium doors, and 5/16 inch on lighter semi-frameless units.
Do all 3/8 inch bottom sweeps include a drip rail?
No. Plain wipe-only sweeps and sweep-plus-drip-rail combos are both sold in 3/8 inch. If water runs off the outside face of the glass, choose the combo version.