Bulb reference
018-3014-96 — Short-length slide-out bulb seal
8-foot black seal; confirm original bulb profile and mounting arrangement, not simply the roll length.
View matching exact-number listingRV Slide-Out Double-Bulb, Wiper & P-Seal Profiles Guide
Identify slide-out wiper, bulb and P-base weatherseals by the actual manufacturer part number and the original seal cross-section. A wiper blade sweeps along the moving room surface; a compressible bulb seals a gap when the room reaches its final position. Separate base, channel and bulb profiles are not interchangeable merely because they are sold as black slide-out weatherstripping.
Factory profile drawings
Compare actual cross sections and mounting methods in AP Products' illustrated catalogs and the manufacturer slide-out seal catalog. The sections below explain where each seal fits. Compare the original profile and dimensions with the product photographs.
What does each seal do?
Flexible lip wipes the slide room during movement. Check lip projection, orientation and edge attachment, not just overall length.
Compresses between mating faces when closed or extended. Check unloaded height, compression gap and the receiving channel.
Holds the seal assembly; mounting may be adhesive, clip-on or channel-based. The base and replaceable D seal may be separate SKUs.
Measure both verticals and horizontals plus required trimming allowance. Verify whether the listing is for a roll, cut length or set.
Compare slide-out seal profiles
Wiper reference
018-478 — Black double-bulb seal with 1½-inch wiper
AP Products: 2 × 2¼-inch double-bulb slide-on clip seal with a 1½-inch wiper, 28-foot roll.
View matching exact-number listingWiper reference
018-478-35 — Black double-bulb seal with 1½-inch wiper, 35 ft
AP Products: 2 × 2¼-inch double-bulb slide-on clip seal with a 1½-inch wiper, 35-foot roll.
View matching exact-number listingWiper reference
018-479 — Black double-bulb seal with 2¼-inch wiper
AP Products: 2 × 3-inch double-bulb seal with a 2¼-inch wiper, 28-foot roll. Longer wiper than 018-478.
View matching exact-number listingWiper reference
018-546 — Black wiper profile
35-foot listed roll; compare attachment flange and lip reach with the original seal.
View matching exact-number listingWiper reference
018-668 — Black snap-in seal with 2⅞-inch wiper
AP Products: 4⅛ × 23/32-inch snap-in seal with a 2⅞-inch wiper, 35-foot roll.
View matching exact-number listingWiper reference
018-1138 — Black single-bulb seal with wiper
AP Products: 1⅛ × 2⅛-inch single-bulb seal with an integrated wiper, 35-foot roll.
View matching exact-number listingBase reference
018-607 — Black P-section slide-out seal
AP Products: 2½ × ⅞-inch P-section seal, 100-foot roll. This is a flexible profile rather than a rigid base.
View matching exact-number listingOther brand reference
21100021 — BAL RV slide-out D-seal bulb
BAL slide-out seal. Compare its mounting method and cross section with the original seal before choosing it in place of an AP Products profile.
View matching exact-number listingDifferent length does not prove the same cross-section
018-478 and 018-478-35 share a manufacturer-listed 2 × 2¼-inch double-bulb profile with 1½-inch wiper, in 28- and 35-foot lengths. 018-479 is a different 2 × 3-inch double-bulb seal with longer 2¼-inch wiper. They have different bulb and wiper dimensions. Measure the original seal rather than choosing by the name or photograph alone. The BAL 21100021 seal belongs to a separate brand family and is shown for reference, not as a recommended replacement for any AP seal.
Additional seal sizes and profiles
018-3203: AP Products specifies a 35-foot version of 018-3203. Confirm the package length before ordering. 018-338-BLK: 018-338-BLK is a slide-in secondary seal; confirm the mounting channel and cross-section. Match the exact package length and seal profile to the original installation.
Check the actual fit before ordering
Inspect an undamaged original seal profile. Record the room manufacturer's sealing arrangement, mounting side, wiper blade length, bulb dimensions, adhesive or clip design, and receiving track. Do not replace an EK/EKD base with a stand-alone wiper when the original design requires a separate bulb. See the EK/EKD base, channel and D-seal guide for those assemblies and door and window seals for separate entry-door profiles.
Safety: Secure the room following the slide-system manufacturer procedure before investigating seal placement. This is a parts-identification reference, not an instruction to support or move the slide room.
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