EXHIBIT 99.4 NOTICE OF GUARANTEED DELIVERY TO TENDER UNREGISTERED 13% SENIOR DISCOUNT DEBENTURES DUE 2009 (INCLUDING THOSE IN BOOK-ENTRY FORM) OF MEDIQ INCORPORATED PURSUANT TO THE EXCHANGE OFFER AND PROSPECTUS DATED , 1998 As set forth in the Prospectus (as defined below), this form or one substantially equivalent hereto must be used to accept the Exchange Offer (as defined below) if certificates for unregistered 13% Senior Discount Debentures due 2009 (the "Old Debentures") of MEDIQ Incorporated are not immediately available or time will not permit a holder's Old Debentures or other required documents to reach the Exchange Agent (as defined below) on or prior to the Expiration Date (as defined below), or the procedure for book-entry transfer cannot be completed on a timely basis. This form may be delivered by facsimile transmission, by registered or certified mail, by hand, or by overnight delivery service to the Exchange Agent. See "THE EXCHANGE OFFERS--Procedures for Tendering" in the Prospectus. THE EXCHANGE OFFER FOR THE OLD DEBENTURES (THE "EXCHANGE OFFER") AND WITHDRAWAL RIGHTS WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME, ON , 1998 ("THE EXPIRATION DATE"), UNLESS THE EXCHANGE OFFER IS EXTENDED BY THE COMPANY. THE EXCHANGE AGENT FOR THE EXCHANGE OFFER IS: UNITED STATES TRUST COMPANY OF NEW YORK BY OVERNIGHT COURIER AND BY HAND BY REGISTERED OR CERTIFIED BY HAND AFTER 4:30 PM UP TO 4:30 PM: MAIL: ON THE EXPIRATION DATE ONLY: United States Trust Company United States Trust Company United States Trust Company of New York of New York of New York 770 Broadway, 13th Floor 111 Broadway P.O. Box 844 New York, New York 10003 Lower Level Cooper Station Attn: Corporate Trust New York, New York 10006 New York, New York 10276-0844 Services Attn: Corporate Trust Attn: Corporate Trust Services Services Telephone: (800) 548-6565 Facsimile: (212) 780-0592 (212) 420-6211 (Originals of all documents sent by facsimile should be sent promptly by registered or certified mail, by hand, or by overnight delivery service.) DELIVERY OF THIS NOTICE TO AN ADDRESS OR TRANSMISSION OF INSTRUCTIONS VIA FACSIMILE OTHER THAN AS SET FORTH ABOVE WILL NOT CONSTITUTE A VALID DELIVERY. Ladies and Gentlemen: The undersigned hereby tenders to MEDIQ Incorporated, a Delaware corporation (the "Company"), in accordance with the Company's offer, upon the terms and subject to the conditions set forth in the Prospectus dated , 1998 (the "Prospectus"), and in the accompanying Letter of Transmittal, receipt of which is hereby acknowledged, $ in aggregate principal amount at maturity of Old Debentures pursuant to the guaranteed delivery procedures described in the Prospectus. Name(s) of Registered Holder(s): ________________________________________________________________________________ (Please Type or Print) Address: _______________________________________________________________________ ________________________________________________________________________________ Area Code & Telephone No: ______________________________________________________ Certificate Number(s) for Old Debentures (if available): _________________________________________________ Total Principal Amount at Maturity Tendered and Represented by Certificate(s): $ ___________________________________________________________ Signature of Registered Holder(s): _____________________________________________ Dated: _________________________________________________________________________ / / The Depository Trust Company (Check if Old Debentures will be tendered by book-entry transfer) Account Number: ________________________________________________________________ THE GUARANTEE BELOW MUST BE COMPLETED GUARANTEE (NOT TO BE USED FOR SIGNATURE GUARANTEE) The undersigned, being a member of or participant in the Securities Transfer Agents Medallion Program, the New York Stock Exchange Medallion Signature Program or the Stock Exchange Medallion Program or an "eligible guarantor institution" within the meaning of Rule 17Ad-15 under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), hereby guarantees (a) that the above named person(s) "own(s)" the Old Debentures tendered hereby within the meaning of Rule 14e-4 under the Exchange Act ("Rule 14e-4"), (b) that such tender of such Old Debentures complies with Rule 14e-4 and (c) to deliver to the Exchange Agent the certificates representing the Old Debentures tendered hereby or confirmation of book-entry transfer of such Old Debentures into the Exchange Agent's account at The Depository Trust Company, in proper form for transfer, together with a Letter of Transmittal (or facsimile thereof), properly completed and duly executed, with any required signature guarantees and any other required documents, within three New York Stock Exchange trading days after the earlier of (i) the date of execution hereof and (ii) the Expiration Date. Name of Firm: __________________________________________________________________ Address: _______________________________________________________________________ ________________________________________________________________________________ Area Code and Telephone No.: ___________________________________________________ Authorized Signature: __________________________________________________________ Name: __________________________________________________________________________ Title: _________________________________________________________________________ Dated: _________________________________________________________________________ NOTE: DO NOT SEND CERTIFICATES OF OLD DEBENTURES WITH THIS FORM. CERTIFICATES OF OLD DEBENTURES SHOULD BE SENT ONLY WITH A PROPERLY COMPLETED AND DULY EXECUTED LETTER OF TRANSMITTAL.